SAN FRANCISCO — Already grappling with an intense heat wave, several Bay Area counties are now under an air quality advisory due to smoke from a wildfire burning in Napa County.

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Smoke from the Pickett Fire is expected to impact Sonoma, Napa and Solano counties on Thursday and Friday, the Bay Area Air District said in a news release.

The air district said conditions can change rapidly and the amount and location of smoke at ground level are hard to predict, but the public can check the U.S. Environmental Protection Agency’s fire and smoke map for real-time pollution levels.

“Smoky, hazy skies may be visible, and the smell of smoke is possible,” the air district said.

Exposure to wildfire smoke, which contains fine particulate matter and other harmful pollutants, is unh

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