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Residents are reporting smells similar to petroleum, paint thinner or butane in the air.

Capt. Tony Bommarito, a public information officer for Orange County Fire, told ABC News that a recent vector control spray for mosquitoes was \"not the cause of the odor.\"

“The OC Vector Control did a targeted spray in a small area with a backpack sprayer,\" Bommarito said. \"It was completely odorless and it’s not the cause of the odor that people have been reporting.”

A spokesperson for the Orange County Mosquito and Vector Control District concurred, saying “the spray is odorless.”

Regarding the chemical smell, you could also report to AQMD at 1-800-288-7664. If you begin to experience any abnormal symptoms, please call 911 to report a medical emergency.

— Costa Mesa FD (@CMFD_PIO) August 17, 2018

The ongoing investigation is now being handled by South Coast Air Quality Management, officials said.

Editor’s note: A previous version of this article included the wrong title for Capt. Bommarito and incorrectly quoted him. We regret the error.

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