Heat is the Hazard Most Teams Underestimate

Heat is the hazard most teams underestimate

May 4, 2026
By PIP Global Safety, for the Blue Print

Heat is one of the most persistent and preventable causes of serious workplace injury and death…yet it remains underestimated across many industries. Each year, thousands of U.S. workers are seriously injured by heat on the job — and dozens don’t make it home. The hardest part? Every one of these tragedies could have been prevented.

The scope of the problem

Heat illness remains one of the most consistent hazards in the workplace. Between 2011 and 2022, 479 workers died from heat-related causes (1)— roughly 40 people a year who left for work and never came back to their families. These aren’t statistics. They are preventable losses.

Where risk shows up

Heat illness affects both outdoor and indoor environments, often where risk is not immediately recognized.

Heat risk is frequently underestimated indoors, where conditions can intensify throughout a shift without natural relief from wind or shade.

Who is most at risk?

Heat illness does not affect all workers equally. Certain workers face even greater danger:

New and returning workers — 50–70% of outdoor heat fatalities happen in the first few days on the job, before the body has built heat tolerance (acclimatization) (3)
Migrant and seasonal workers — often face language barriers and less control over working conditions
Older workers and those with health conditions — cardiovascular disease, diabetes, obesity, and some medications impair the body's ability to cool itself.

When is risk highest?

Heat stress rarely comes from a single factor...it comes from stacked conditions.

Heat illness is most likely to strike during heat waves --- especially in the first few days when humidity is high. There is little to no airflow, and workers are exposed to direct sun on rooftops, fields, or hot pavement. Heavy physical labor, non-breathable protective gear, and indoor environments packed with heat generating equipment like furnaces and ovens all make things worse.

Know the warning signs and educate workers

Heat illness escalates quickly – workers should never push through symptoms.

Heat Exhaustion: Watch for heavy sweating, pale/clammy skin, weakness, nausea, headache, fast weak pulse. Move the person to a cool area, remove excess layers, apply cool cloths, and provide fluids/hydration. Seek medical help if symptoms persist.

Heat Stroke — This is a Medical Emergency: Signs include high body temperature, confusion, slurred speech, no sweating, and unconsciousness. Call 911 immediately. Immerse in cold water or apply ice to head, neck, and armpits. Never leave the person alone.

When in doubt — cool the worker and call 911. Do not try to diagnose which illness is occurring. Conditions can go from bad to life threatening in minutes – get help.

The law is catching up

Regulators are taking heat illness more seriously than ever:

OSHA's Proposed Federal Standard (2024): In August of 2024, OSHA published its first-ever proposed rule on Heat Injury and Illness Prevention — covering approximately 36 million workers in construction, agriculture, manufacturing, maritime, and general industry. A final ruling is anticipated by 2026.

New Industry Standard — ANSI/ASSP A10.50-2024: This newly released standard sets minimum requirements for heat stress management in construction and demolition operations. It provides employers with a clear framework for risk assessment, mitigation planning, hydration, training, emergency response, and recordkeeping.

Current Enforcement: Even without a final rule, OSHA issued over $2 million in heat-related penalties in 2024 and has conducted 5,000 federal heat inspections since 2022 under its National Emphasis Program. (4)

State Level Action: California, Colorado, Oregon, Washington, and Minnesota have enacted workplace heat regulations. Maryland has a proposed standard in the works.

What employers are required to provide

Employers are expected to provide a baseline set of protections on heat exposure.

Water — Free, cool, clean drinking water throughout the shift
Rest breaks — Paid cool-down breaks (min.15 minutes every 2 hours at high heat)
Shade or cool areas — Accessible during breaks, not just a hot car or open tent
Acclimatization — New/returning workers gradually eased into heat exposure over days
Training — Clear education on heat risks and early warning signs, as well as emergency response
Observation — Buddy system or supervisor monitoring for signs of illness
Emergency plan — Clear procedures for 911, cooling, and transport to medical care
PPE — Cooling wraps, hydration products, quick-dry fabrics, and heat-resistant gear where appropriate
Risk assessments — Site-specific evaluations of temperature, humidity, workload, and radiant heat – use the WBGT method Wet Bulb Globe Thermometer which combines temperature, humidity, sun and wind.

OSHA provides a full list of detailed recommendations to ensure new workers’ safety: https://www.osha.gov/heat-exposure/protecting-new-workers

The bottom line: Heat illness is not unpredictable—The conditions are well documented, the warning signs are identifiable, and the prevention measures are established.

What determines outcome is execution – how consistently those measures are applied in the field, under real world working conditions.

Sources

U.S. Bureau of Labor Statistics, Census of Fatal Occupational Injuries
BLS, via OSHA NPRM Rulemaking Record, reginfo.gov
OSHA, www.osha.gov/heat-exposure
OSHA, www.osha.gov/news/newsreleases/osha-national-news-release/20230727

Content originally from PIP Global Safety. Reused here with permission.