Smoke billows from Chevron oil refinery in Richmond, Calif. on Saturday, June 1, 2025. (Bay Area Air District/Facebook via Bay City News)

THE BAY AREA AIR DISTRICT reached an agreement with Chevron on a new air pollution monitoring system at its Richmond refinery that will bring enhanced monitoring for hydrogen sulfide, a smelly and potentially dangerous gas previously not properly monitored according to the Air District’s standards. 

Chevron is the first of the five oil refineries in the nine-county BAAD to reach an agreement with the Air District after all the refineries’ fenceline monitoring programs were deemed insufficient and were “disapproved” in October 2023. 

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