California will set heat stress standards for workers laboring indoors, according to a new state law (S.B. 1167) taking effect Jan. 1.

The law requires the California Division of Occupational Safety and Health (Cal/OSHA) to develop a proposed standard within two years covering heat illness and injury prevention for inside workplaces.

California already has a heat stress rule for outdoor workers, most recently revised in 2015 (Title 8, Section 3395).

The federal Occupational Safety and Health Administration doesn’t have a rule specifically aimed at heat stress. However, federal OSHA can cite employers using the general duty clause to...