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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 Board of Directors has adopted amendments to Regulation 9, Rules 4 and 6, to eliminate emissions of nitrogen oxides, or NOx, from residential and commercial natural gas furnaces and water heaters in the Bay Area by requiring new appliances to be zero-NOx.