This standard applies to most workplaces where the indoor temperature reaches 82°F. It establishes required safety measures for indoor workplaces.The new regulation applies to most California workplaces where the indoor temperature reaches 82°F or higher (e.g. California's Heat Illness Prevention Standard requires employers to provide training, water, shade, and planning. The state just passed a rule protecting people who work indoors in industries like warehousing, restaurants or manufacturing from excessive heat. A new heat illness standard for indoor work areas in California will take effect on August 1. The heat rule was initially expected to be implemented in 2019 but faced five years of delays. In the summer of 2023, the U.S. Department of Labor issued its first heat hazard alert. A new heat illness standard for indoor work areas in California will take effect on August 1. Construction workers work on a building on Nov.