Bay Area air quality officials announced this week that Chevron has been fined $900,000 for shortcomings in pollution monitoring at its Richmond refinery.

According to the Air District, parts of Chevron’s monitoring network were not properly set up to detect the full spectrum of potential emissions and were limited in the amount they could measure.

Auditors identified deficiencies in 20 of the company’s monitors, prompting an order for Chevron to upgrade its equipment.

When the company did not complete those upgrades by the mandated deadline, the Air District issued nine violation notices, officials said.

“Requiring Chevron to install and maintain its own monitors ensures more comprehensive emissions data and supports both compliance and transparency,” said Philip Fine, the Air District’s executive officer.

District officials said Chevron has since corrected the issues, and inspectors are verifying that all monitors are functioning as required.

A Chevron representative stated via email that the company agreed to install an additional set of monitors “exceeding federal requirements,” noting that the move is costly and offers “minimal benefit.”