Smoke is visible in the area as flares could be seen coming from Phillips 66 Refinery in Rodeo.
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The Contra Costa Health Department said the hazardous materials team is monitoring the air quality.
No offsite health impacts related to this incident have been reported to CCH. The cause of the flaring is under investigation.
This follows a series of notable flaring incidents from nearby refineries.
There was one in Martinez last November that saw hazardous materials released into the air.
It was enough to prompt a warning earlier this year for people not to eat any produce grown in their yards.