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Learn about the Air District's development process for Regulation 13, Rule 4, which would reduce emissions of methane from municipal sewage treatment and anaerobic digester operations in the Bay Area.

The Bay Area Air Quality Management District announced that Tesoro Refining & Marketing Co. has agreed to pay $4 million to settle alleged air pollution violations at its Golden Eagle Refinery in Martinez.

The Air District’s Board of Directors approved the allocation of $3 million to support the electrification of the Caltrain corridor between San Francisco and San Jose.

The Air District is issuing a Spare the Air Alert for smog for Tuesday, September 3 through Wednesday, September 4. Air quality is forecast to be unhealthy. High inland temperatures and light winds, combined with motor vehicle exhaust, will create elevated concentrations of ozone, or smog.