This standard applies to most workplaces where the indoor temperature reaches 82°F. It establishes required safety measures for indoor workplaces.As of July 24, employers in the state must adopt safety measures that go into effect in most cases when indoor temperatures reach 82°F. The new rule applies to most indoor work areas in California when the indoor temperature equals or exceeds 82°F when workers are present. California's Heat Illness Prevention Standard requires employers to provide training, water, shade, and planning. The new regulation takes effect whenever employees are present in any indoor working space and the temperature reaches 82°F or higher. Current recommendations include using a staggered approach over 714 days to give these workers time to get used to working in hot environments. In the absence of robust federal guidance, individual cities like Phoenix, Ariz. Contractors have the right to refuse to work in unsafe conditions, including extreme heat, if they believe their health or safety is at risk. The new rules require employers to provide heat safety training, cooling areas and water when the indoor temperature reaches 82 degrees.