The Office of Environmental Health Hazard Assessment (OEHHA)

Our mission is to protect and enhance the health of Californians and our state’s environment through scientific evaluations that inform, support and guide regulatory and other actions.

To learn more about OEHHA click here.

Wild Fire Smoke - A Guide for Public Health Officials is designed to help local public health officials prepare for smoke events, take measures to protect the public when smoke is present, and communicate with the public about wildfire smoke and health.

Protecting Public Health from Home and Building Fire Ash This report summarizes safe methods of ash cleanup. Protección de la Salud Pública contra las Cenizas de Incendios en Casas y Edificios (Spanish)


For more information on: How Smoke from Fires Can Affect Your Health


Jan 3, 2019: The Human Right to Water in California
OEHHA has released of A Framework and Tool for Evaluating California’s Progress in Achieving the Human Right to Water for public comment. This draft report describes an approach for evaluating the adequacy of water quality, accessibility and affordability across California's community water systems.
Dec 20, 2018: 2018 Children’s Environmental Health Symposium Presentations
2018 Children's Environmental Health Symposium Presentations exploring "Air Pollution and Lifecourse Neurological Impacts.” The symposium will be held October 2, 2018 and will examine the potential factors underlying children's unique vulnerabilities to the cumulative impacts of pollution and socioeconomic and community stressors.