Bay Area air quality regulators announced this week that Chevron was hit with a $900,000 fine for air pollution monitoring failures at its Richmond refinery.

Bay Area Air District officials said Tuesday that portions of Chevron's air monitoring system weren't "configured to detect the full range of potential emissions and were limited in how much emissions they could measure."

After Air District auditors found that 20 of Chevron's monitors weren't up to snuff, the company was ordered to make upgrades.

When Chevron "failed to implement the upgrades by the required deadline, the Air District issued nine notices of violation," district officials said in a news release.

"Requiring Chevron to install and maintain its own monitors provides additional emissions data and further supports compl

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