CBS Bay Area, by Dave Pehling, November 27, 2023

RICHMOND — Flaring activity at the Chevron Richmond refinery Monday afternoon due to a loss of power at part of the facility has sent a large cloud of black smoke over the region.

A Facebook post by the Chevron Richmond account shortly after 4 p.m. confirmed that the workers at the facility were attempting to “quickly to minimize and stop the flaring.” The post said a “Community Warning System (CWS) Level 1” was issued due to smoke and the visible flaring. This type of warning does not require action by the public, the post said.

A representative from Contra Costa Health (CCH) confirmed that Chevron Richmond notified them about the flaring due to “an unplanned unit shutdown” at about 3:30 p.m. CCH said it was sending a hazardous materials team to the refinery to investigate, but no shelter-in-place order has been issued in connection with the incident.

Flaring at the refinery in Richmond is sending up a LOT of dark smoke — plume is blowing to the west. Ground-level air quality not showing any dramatic decline according to the EPA and @ThePurpleAir monitors. pic.twitter.com/UKOeo1nH3p

— Paul Heggen (@PaulKPIX) November 28, 2023

KPIX chief meteorologist Paul Heggen said the smoke plume is blowing to the west. According to the EPA and Purple Air monitors, there has not been a dramatic decline of ground-level air quality.

The Bay Area Air Quality Management District has not issued an alert regarding the incident and was currently showing the air quality to be moderate in the area around the refinery. District officials confirmed that their inspectors were investigating at the refinery and that they were “documenting any violations of air quality regulations and assisting first responders.”

The district initially said four complaints were received as of around 4:30 p.m. As of an hour later, 51 complaints had been submitted.

Richmond Fire officials are also at the scene and monitoring air quality.