Why WBGT Is the Standard for Measuring Worker Heat Stress
European trade unions have drafted new legislation that would give millions of outdoor and indoor workers an enforceable right to stop working when heat becomes dangerous, and the threshold they're proposing isn't based on air temperature at all. It's based on Wet Bulb Globe Temperature, ...
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The Marine Corps has issued updated interim guidance on preventing heat and cold weather injuries, marking the first revision to its extreme weather safety policy in eleven years. The new directive pushes commanders and officers in charge to expand training, formalize response plans, and build standard operating procedures for training and ...
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Heat safety involves a specific vocabulary that mixes meteorology and occupational health - terms like WBGT, heat index, dew point, heat advisory, and heat dome all describe different things and shouldn't be used interchangeably. WBGT measures actual heat stress on the body using temperature, humidity, radiant heat, and wind; heat index...
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A County-by-County Guide to Texas UIL Heat Stress Classifications for the 2026-27 School Year
Quick answer: Texas UIL schools are divided into two heat stress classifications based on geography. Class 2 applies to West Texas and the Panhandle — regions with lower baseline humidity — and modifications begin at a lower WBGT of 79.7&...
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OSHA has extended its Heat National Emphasis Program (Heat NEP) through April 2031, giving the agency five more years to enforce heat safety at worksites nationwide before deciding on a permanent federal heat standard. The updated program adds clearer inspection appendices and checklists, expands the industries it covers, and continues to...
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What Each Flag Color Actually Requires — and What Happens if Conditions Change Mid-Practice
Quick answer: The UIL activity chart has five flag levels — Green, Yellow, Orange, Red, and Black — each tied to a specific WBGT range. Each level carries required modifications to practice duration, equipment, and rest ratios. The chart ...
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Quick answer: On June 30, 2026, New York City issued Executive Order No. 17, directing city agencies to build and implement heat illness prevention programs for municipal employees and to extend equivalent heat safety requirements to city contractors. The order doesn't set a single citywide standard; instead, it requires each agency to ...
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California has the most comprehensive and well-established heat illness prevention standards in the United States. Enforced by Cal OSHA, the state’s heat stress regulations apply to outdoor workers and, increasingly, to indoor workplaces as well. Given California’s frequent high temperatures and diverse labor force, these rules are detailed, ...
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When temperatures rise, one of the most common questions people ask is:
"How do you accurately measure heat stress?"
The answer increasingly points to Wet Bulb Globe Temperature (WBGT), a method widely used in occupational safety, athletics, and the military to assess heat risk more accurately than temperature or heat index alone.
This guide ...
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Nevada is one of the hottest states in the country. With summer temperatures frequently exceeding 100°F, heat exposure is a serious and ongoing workplace hazard. Construction crews, agricultural workers, warehouse employees, utility teams, and hospitality staff are regularly exposed to extreme environmental conditions. As heat-related illness ...
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