California desert air regulators tighten rules on industrial boiler pollution

US environmental regulators approved new rules for industrial boilers, steam generators, and process heaters in California's Mojave Desert. These rules set stricter limits on nitrogen oxide emissions, which contribute to smog and air pollution.

The Mojave Desert is a major logistics hub, with warehouses and industrial facilities that use these types of equipment. Tighter emission rules mean these facilities will need to upgrade their equipment or change their operations to comply. This is part of a long-term trend of tightening air quality standards in California, which often sets precedents for other states.