Heat Illness

​​​​Exposure to conditions of extreme heat and high humidity can subject employees to physical conditions that can range from uncomfortable to life-threatening. This section describes those conditions and the environmental and personal factors that create risk to employees.

All California outdoor workplaces are subject to the heat illness standard. Other places of outdoor employment are subject to both the standard and special high-heat procedures.

  • New legislation passed in the 2016 legislative session requires Cal/OSHA​ to propose a heat-illness and injury prevention standard for indoor workers by January 1, 2019.1​​

This new law does not specify what provisions will be included in th​e indoor heat illness standard or what types of workplaces will be covered — potentially the new standard could cover all indoor workplaces, including air conditioned offices. Employers will be able to offer comments during a rulemaking process.

In the interim, employers should be mindful that current workplace safety regulations already require employers to provide a safe workplace to their employee. For more information, see Outdoor Workplaces vs. Indoor Workplaces.​


1. Lab. Code sec. 6720​​​