{"id":122768,"date":"2025-07-08T08:17:10","date_gmt":"2025-07-08T08:17:10","guid":{"rendered":"https:\/\/lsi-lastem.com\/?p=122768"},"modified":"2026-04-13T16:38:09","modified_gmt":"2026-04-13T14:38:09","slug":"wbgt-vs-phs-heat-stress","status":"publish","type":"post","link":"https:\/\/lsi-lastem.com\/es\/wbgt-vs-phs-heat-stress\/","title":{"rendered":"WBGT vs PHS: assessing heat stress in the workplace"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"122768\" class=\"elementor elementor-122768\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9324e58 e-flex e-con-boxed e-con e-parent\" data-id=\"9324e58\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fc85cda elementor-widget elementor-widget-heading\" data-id=\"fc85cda\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">WBGT vs PHS: methods compared for assessing heat stress in the workplace\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ad71b98 elementor-widget elementor-widget-image\" data-id=\"ad71b98\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1180\" height=\"490\" src=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/WBGT-vs-PHS-ENG-int.webp\" class=\"attachment-full size-full wp-image-122771\" alt=\"WBGT vs PHS: methods compared for assessing heat stress in the workplace\" srcset=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/WBGT-vs-PHS-ENG-int.webp 1180w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/WBGT-vs-PHS-ENG-int-300x125.webp 300w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/WBGT-vs-PHS-ENG-int-1024x425.webp 1024w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/WBGT-vs-PHS-ENG-int-768x319.webp 768w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/WBGT-vs-PHS-ENG-int-1000x415.webp 1000w\" sizes=\"(max-width: 1180px) 100vw, 1180px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-28c4d25 e-flex e-con-boxed e-con e-parent\" data-id=\"28c4d25\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-dd52f65 elementor-widget elementor-widget-text-editor\" data-id=\"dd52f65\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Climate change and the increase in global temperatures are making the monitoring of <\/span><b>heat stress in workplaces<\/b><span style=\"font-weight: 400;\"> increasingly urgent, especially in industrial environments, construction sites, and non-air-conditioned indoor spaces. Prolonged exposure to critical climate conditions can compromise <\/span><b>workers&#8217; health<\/b><span style=\"font-weight: 400;\">, reduce productivity and increase the risk of accidents and heat stroke.<\/span><\/p><p><span style=\"font-weight: 400;\">In this context, the <\/span><b>WBGT (Wet Bulb Globe Temperature)<\/b><span style=\"font-weight: 400;\"> and <\/span><b>PHS (Predicted Heat Strain) <\/b><span style=\"font-weight: 400;\">methods represent two fundamental approaches to assess and prevent hazardous situations.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e5ac9c elementor-widget elementor-widget-heading\" data-id=\"3e5ac9c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">WBGT and PHS: Two approaches to the same goal\n\n\n\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-db7d141 elementor-widget elementor-widget-text-editor\" data-id=\"db7d141\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Both indices are recognized by international standards (ISO 7243 for WBGT and ISO 7933 for PHS) as methods for estimating <\/span><b>occupational heat <\/b><span style=\"font-weight: 400;\">risk. However, they present substantial differences in terms of complexity, accuracy and scope of application.<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>WBGT <\/b><span style=\"font-weight: 400;\">is a rapid, simple and intuitive method, ideal for <\/span><b>preliminary investigations<\/b><span style=\"font-weight: 400;\">;<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>PHS <\/b><span style=\"font-weight: 400;\">is an advanced analytical method, more suitable for in-depth analyses in <\/span><b>severe and complex environments<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><\/ul><p><b>Using them in combination<\/b><span style=\"font-weight: 400;\"> is the most effective strategy <\/span><b>for a complete assessment:<\/b><span style=\"font-weight: 400;\"> WBGT can serve as a first filter to identify critical situations, while PHS can come into play for the detailed analysis of the most at-risk conditions.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a48ab5 elementor-widget elementor-widget-heading\" data-id=\"4a48ab5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How WBGT and PHS indices are calculated\n\n\n\n\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf539a4 elementor-widget elementor-widget-heading\" data-id=\"cf539a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1) WBGT \u2013 simplicity and immediacy\n\n\n\n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-caf6aeb elementor-widget elementor-widget-text-editor\" data-id=\"caf6aeb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The calculation of the WBGT index is based on three fundamental environmental quantities:<\/span><\/p><ul><li aria-level=\"1\"><b>Black globe temperature (Tg)<\/b><span style=\"font-weight: 400;\">;<\/span><\/li><\/ul><ul><li aria-level=\"1\"><b>Wet bulb temperature (Tnw)<\/b><span style=\"font-weight: 400;\">;<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Air temperature (Ta)<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Depending on the presence or absence of direct solar radiation, different formulas are used:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>WBGT outdoor:<\/b><span style=\"font-weight: 400;\"> 0.7\u00d7Tnw + 0.2\u00d7Tg + 0.1\u00d7Ta<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>WBGT indoor <\/b><span style=\"font-weight: 400;\">(or without sun exposure): 0.7\u00d7Tnw + 0.3\u00d7Tg<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">The <\/span><b>WBGT index<\/b><span style=\"font-weight: 400;\"> is expressed in degrees Celsius (\u00b0C) and provides an immediate indication of the level of risk. It is possible to customize the result with <\/span><b>clothing <\/b><span style=\"font-weight: 400;\">values <\/span><b>\u200b\u200b(CAV)<\/b><span style=\"font-weight: 400;\"> and<\/span><b> metabolic rate<\/b><span style=\"font-weight: 400;\">, thus obtaining the <\/span><b>actual WBGT<\/b><span style=\"font-weight: 400;\"> and the <\/span><b>reference WBGT <\/b><span style=\"font-weight: 400;\">for acclimatized or non-acclimatized subjects.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7e0c7b0 elementor-widget elementor-widget-heading\" data-id=\"7e0c7b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2) PHS \u2013 Advanced Heat Balance Analysis\n\n\n\n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4d61714 elementor-widget elementor-widget-text-editor\" data-id=\"4d61714\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The PHS method provides a more detailed <\/span><b>thermo-physiological model<\/b><span style=\"font-weight: 400;\"> and requires both environmental and individual parameters:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Air temperature (Ta);<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Relative humidity;<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Air speed;<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Average radiant temperature;<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Activity performed<\/b><span style=\"font-weight: 400;\">;<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Clothing insulation<\/b><span style=\"font-weight: 400;\">;<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Worker weight and height<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">The PHS calculates, among other things, the temporal evolution of:<\/span><\/p><ul><li aria-level=\"1\"><b>Core body temperature<\/b><span style=\"font-weight: 400;\">;<\/span><\/li><\/ul><ul><li aria-level=\"1\"><b>Fluid loss due to sweating<\/b><span style=\"font-weight: 400;\">;<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Maximum safe exposure duration (Dlim)<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">This makes it an irreplaceable tool for designing <\/span><b>breaks<\/b><span style=\"font-weight: 400;\">, <\/span><b>staff rotation<\/b><span style=\"font-weight: 400;\">, <\/span><b>hydration <\/b><span style=\"font-weight: 400;\">and other prevention strategies.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-049107c elementor-widget elementor-widget-heading\" data-id=\"049107c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Advantages and limitations of the WBGT index\n\n\n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-349d174 elementor-widget elementor-widget-text-editor\" data-id=\"349d174\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The <\/span><b>WBGT <\/b><span style=\"font-weight: 400;\">index is a widely used tool for a<\/span><b> preliminary assessment of heat stress risk<\/b><span style=\"font-weight: 400;\">. Its main strength is its<\/span><b> simplicity of application<\/b><span style=\"font-weight: 400;\">: it requires a limited set of environmental data and returns a result expressed in \u00b0C, easily interpretable even by non-specialized personnel. The calculation is rapid and allows for the rapid identification of <\/span><b>potentially dangerous situations<\/b><span style=\"font-weight: 400;\">. Furthermore, it offers useful indications for <\/span><b>immediate environmental interventions<\/b><span style=\"font-weight: 400;\">, such as shielding direct heat sources.<\/span><\/p><p><span style=\"font-weight: 400;\">However, the method has <\/span><b>limitations<\/b><span style=\"font-weight: 400;\">, especially in complex or high-risk contexts. The WBGT is based on a <\/span><b>general estimate of the heat balance <\/b><span style=\"font-weight: 400;\">and uses a standard value for clothing insulation (0.6 Clo), with the possibility of adaptations for specific technical garments. It does not consider <\/span><b>individual physiological variables<\/b><span style=\"font-weight: 400;\"> such as weight and height. For this reason, it is often advisable to use it as a first screening tool, to be integrated with more in-depth methods, such as the PHS, if the detected values \u200b\u200bexceed the reference thresholds.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-27db16e elementor-widget elementor-widget-heading\" data-id=\"27db16e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Advantages and limitations of the PHS index\n\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-61e0e35 elementor-widget elementor-widget-text-editor\" data-id=\"61e0e35\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The <\/span><b>PHS <\/b><span style=\"font-weight: 400;\">method is the most detailed and reliable tool for <\/span><b>risk assessment in hot and severe thermal environments<\/b><span style=\"font-weight: 400;\">. It is based on an in-depth analysis of the <\/span><b>individual&#8217;s thermal balance<\/b><span style=\"font-weight: 400;\">, allowing for the monitoring of key variables for risk assessment over time, such as total fluid loss and core body temperature. This allows for the limitation of internal temperature increases by introducing <\/span><b>exposure time limits<\/b><span style=\"font-weight: 400;\">. In addition, the method takes into account the <\/span><b>specific insulation of clothing <\/b><span style=\"font-weight: 400;\">and some individual characteristics, such as weight and height, providing precise indications for optimising the organisation of the working day and limiting exposure times, also providing<\/span><b> strategic breaks<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">However, the PHS method is more complex, requiring a <\/span><b>greater commitment <\/b><span style=\"font-weight: 400;\">in terms of time for <\/span><b>data collection<\/b><span style=\"font-weight: 400;\">, <\/span><b>analysis<\/b><span style=\"font-weight: 400;\"> and <\/span><b>synthesis<\/b><span style=\"font-weight: 400;\">. Furthermore, it does not provide immediate or simple indications on how to intervene to shield or reduce the heat source.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b215b21 elementor-widget elementor-widget-heading\" data-id=\"b215b21\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The synergy of the two methods in practice with LSI LASTEM\n\n\n\n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d465a07 elementor-widget elementor-widget-text-editor\" data-id=\"d465a07\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The<\/span><b> combined<\/b><span style=\"font-weight: 400;\"> application of<\/span><b> WBGT<\/b><span style=\"font-weight: 400;\"> and <\/span><b>PHS<\/b><span style=\"font-weight: 400;\">, as also suggested by ISO standards, represents the <\/span><b>best practice<\/b><span style=\"font-weight: 400;\"> for <\/span><b>managing thermal stress risk<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">Thanks to solutions such as the <\/span><a href=\"https:\/\/lsi-lastem.com\/products\/portable-wireless-wbgt-meter-heat-shield\/\"><b>Heat Shield<\/b><\/a><b> system<\/b><span style=\"font-weight: 400;\">, <\/span><b>portable microclimatic stations <\/b><span style=\"font-weight: 400;\">(<\/span><a href=\"https:\/\/lsi-lastem.com\/solfycta-uploads\/PDF\/MW9020\/MW9020-ENG-Microclimate.pdf\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">data sheet<\/span><\/a><span style=\"font-weight: 400;\">) and <\/span><a href=\"https:\/\/lsi-lastem.com\/products\/istsa-heat-stress-automatic-stations\/\"><b>ISTSA stations<\/b><\/a><span style=\"font-weight: 400;\"> by LSI LASTEM, companies can monitor both indices in real time, manage alarms, send data via SCADA or use dedicated software for analysis and reporting (such as <\/span><a href=\"https:\/\/lsi-lastem.com\/gidastea\/\"><span style=\"font-weight: 400;\">GIDAS-TEA<\/span><\/a><span style=\"font-weight: 400;\">) and <\/span><b>prevent critical situations before they become dangerous<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e5dbddd elementor-widget elementor-widget-heading\" data-id=\"e5dbddd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Choosing the right tool to protect workers\n\n\n\n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a37c9f2 elementor-widget elementor-widget-text-editor\" data-id=\"a37c9f2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">In the current scenario, where<\/span><b> record temperatures <\/b><span style=\"font-weight: 400;\">are increasingly frequent, it is essential to equip oneself with reliable and versatile technological tools. The integrated use of WBGT and PHS indices, supported by advanced <\/span><b>environmental monitoring<\/b><span style=\"font-weight: 400;\"> systems, allows to safeguard the health of workers, optimize shifts and prevent the effects of extreme heat.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3bf0b94 e-flex e-con-boxed e-con e-child\" data-id=\"3bf0b94\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-323cc06 elementor-widget-mobile__width-initial elementor-widget elementor-widget-heading\" data-id=\"323cc06\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Download the article:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-21fc305 elementor-mobile-align-center elementor-widget-mobile__width-initial elementor-widget elementor-widget-button\" data-id=\"21fc305\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/WBGT-vs-PHS_-methods-compared-for-assessing-heat-stress-in-the-workplace.pdf\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-download\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M216 0h80c13.3 0 24 10.7 24 24v168h87.7c17.8 0 26.7 21.5 14.1 34.1L269.7 378.3c-7.5 7.5-19.8 7.5-27.3 0L90.1 226.1c-12.6-12.6-3.7-34.1 14.1-34.1H192V24c0-13.3 10.7-24 24-24zm296 376v112c0 13.3-10.7 24-24 24H24c-13.3 0-24-10.7-24-24V376c0-13.3 10.7-24 24-24h146.7l49 49c20.1 20.1 52.5 20.1 72.6 0l49-49H488c13.3 0 24 10.7 24 24zm-124 88c0-11-9-20-20-20s-20 9-20 20 9 20 20 20 20-9 20-20zm64 0c0-11-9-20-20-20s-20 9-20 20 9 20 20 20 20-9 20-20z\"><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">WBGT vs PHS: methods compared for assessing heat stress in the workplace<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e545cef e-flex e-con-boxed e-con e-parent\" data-id=\"e545cef\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-eef6fc9 e-con-full e-flex e-con e-child\" data-id=\"eef6fc9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-dd53866 elementor-widget-mobile__width-initial elementor-widget elementor-widget-heading\" data-id=\"dd53866\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">FAQ: Frequently Asked Questions<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5cd08d1 elementor-widget elementor-widget-n-accordion\" data-id=\"5cd08d1\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;all_collapsed&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-9730\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-9730\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> WBGT or PHS: which index should be used to assess heat stress? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-9730\" class=\"elementor-element elementor-element-72b16e2 e-con-full e-flex e-con e-child\" data-id=\"72b16e2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2ce2add elementor-widget elementor-widget-text-editor\" data-id=\"2ce2add\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">It depends on the objective. WBGT is ideal for rapid heat stress risk screening, while PHS is better suited for more in-depth assessments in severe or complex conditions. In many cases, the most effective approach is to use WBGT first and then PHS for a more detailed analysis.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-9731\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-9731\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> When is WBGT not sufficient on its own? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-9731\" class=\"elementor-element elementor-element-8617b21 e-con-full e-flex e-con e-child\" data-id=\"8617b21\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e56f610 elementor-widget elementor-widget-text-editor\" data-id=\"e56f610\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">WBGT may not be enough when a more precise estimate of the worker\u2019s physiological response is needed, or when exposure and recovery times must be defined. In these cases, PHS is more useful because it considers a wider range of environmental and personal variables and allows for a more complete evaluation of the heat balance.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-9732\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-9732\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> What is the main advantage of WBGT? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-9732\" class=\"elementor-element elementor-element-acf1ef1 e-con-full e-flex e-con e-child\" data-id=\"acf1ef1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-00be308 elementor-widget elementor-widget-text-editor\" data-id=\"00be308\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The main advantage of WBGT is speed. It is an index that is simple to apply in the field, easy to interpret, and very useful for quickly identifying critical situations in the workplace. For this reason, it is often the first step in heat stress assessment.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-9733\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-9733\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Why is PHS considered a more advanced method? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-9733\" class=\"elementor-element elementor-element-78a5e98 e-con-full e-flex e-con e-child\" data-id=\"78a5e98\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-585e6a3 elementor-widget elementor-widget-text-editor\" data-id=\"585e6a3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Because PHS does not simply provide a synthetic index, but estimates the impact of heat on the human body in greater detail and over time. It can help assess body temperature, fluid loss, and maximum exposure duration, making it particularly useful in high-risk contexts.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-9734\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"5\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-9734\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> How does LSI LASTEM instrumentation support both WBGT and PHS? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-9734\" class=\"elementor-element elementor-element-f8c74c4 e-con-full e-flex e-con e-child\" data-id=\"f8c74c4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-65420a5 elementor-widget elementor-widget-text-editor\" data-id=\"65420a5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">LSI LASTEM instrumentation makes it possible to directly measure the environmental parameters needed for a reliable heat stress assessment, such as Tg, Tnw, Ta, RH, and air velocity. This strengthens WBGT calculation in the field and also provides a consistent data basis for more in-depth analysis using the PHS model, which can be easily calculated with LSI LASTEM software.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<script type=\"application\/ld+json\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"WBGT or PHS: which index should be used to assess heat stress?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It depends on the objective. WBGT is ideal for rapid heat stress risk screening, while PHS is better suited for more in-depth assessments in severe or complex conditions. In many cases, the most effective approach is to use WBGT first and then PHS for a more detailed analysis.\"}},{\"@type\":\"Question\",\"name\":\"When is WBGT not sufficient on its own?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"WBGT may not be enough when a more precise estimate of the worker\\u2019s physiological response is needed, or when exposure and recovery times must be defined. In these cases, PHS is more useful because it considers a wider range of environmental and personal variables and allows for a more complete evaluation of the heat balance.\"}},{\"@type\":\"Question\",\"name\":\"What is the main advantage of WBGT?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The main advantage of WBGT is speed. It is an index that is simple to apply in the field, easy to interpret, and very useful for quickly identifying critical situations in the workplace. 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