Heat Illness Prevention

sweating in the heatWhat is heat illness?

Heat illness is a medical condition resulting from the body’s inability to cope with a particular heat load and includes, but is not limited to, heat cramps, heat rash, heat exhaustion, fainting, and heatstroke. Prolonged or intense exposure to hot conditions and heavy physical work even in cooler conditions can lead to your body overheating. Symptoms of heat illness may not be recognized initially and can quickly progress.

Why is it important to know about heat illness?

Heat illness is preventable but, if left unchecked, could lead to death. People who work outside, especially in the summer, are exposed to heat and can get heat illness. Heat illness can also lead to injuries. Workers are more likely to get injured if they get tired or dizzy from the heat while working. Heat exposure can also lead to heatstroke, a condition that can be fatal. What you learn here will prepare you for helping your co-workers and yourself stay safe when working in hot weather.


Heat training booklet

   New Heat Toolkit

   Learn More


Popular PNASH Resources

Quick Signs and Dangers Reference Table pdf English Spanish

Heat Illness Types pdf English/Spanish

Heat Stress Jeopardy PPT English Spanish

Signs and Symptoms Body Map pdf English/Spanish

Prevention Information pdf English/Spanish

Washington State Heat Rule

The Washington State Heat rule (WAC 296-307-097) is effective from May 1st - September 30th every year. During this time, employers are required to implement a heat illness accident prevention plan, monitor employees, provide water, and train workers. Visit the WA Department of Labor and Industries webpage to learn more about these requirements.

Regional and National Resources

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Heat Stress

PNASH Resources

hand washing

Masks in Heat

Tips for working in heat while wearing a mask. Available in Spanish and English.

Heat training book cover

Heat Illness Facilitator's Guide

A train-the-trainer guide for the identification, prevention, and treatment of heat illness in outdoor agricultural workers. Part of the Heat Illness Toolkit.


Symptoms and Treatments Poster

Know the symptoms and treatment to prevent serious heat illness and death. Part of the Heat Illness Toolkit.

PNASH Research

A Multi-Level Approach to Heat Related Illness Prevention in Agricultural Workers

NIOSH 2016-2022 | June Spector, MD, MPH

This project proposes to develop and evaluate a multi-level approach to heat-related illness (HRI) prevention in agricultural workers. The intervention will develop tools to prevent the negative health effects of prolonged heat for individuals (knowledge and behaviors), workplaces (policies and practices), and communities (homes).

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Heat Exposure, Injury Risk, and Productivity in Agricultural Workers

NIOSH 2014-2017 | June Spector, MD, MPH

This project examines the association between heat exposure and traumatic injury risk in agricultural workers, the relationship between heat stress and productivity, and the feasibility of using a biomarker of heat acclimation to detect workers at risk for heat-related illness and injury, with the ultimate goal of prevention. 

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Safety and Health of Latino Immigrant Forestry Services Workers in the Pacific Northwest

NIOSH 2014-2017 | Butch de Castro, PhD, MSN, MPH

The forest service workforce in the Pacific Northwest is largely immigrant, low-literate, and Spanish-speaking with unique vulnerabilities due to a lack of skills and safety training, occupational immobility, remote work locations, and small contractor employment.

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