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Massive fires ringing the San Francisco Bay Area are continuing to create dangerous air quality.

In many neighborhoods, a layer of ash has covered the ground, distributed by gusty winds and adding to the pollution that is clouding much of the area.

The American Lung Assn. warned that excessive heat, wildfire smoke and COVID-19 posed risks to those most vulnerable to respiratory problems.

“The combination of uncontained wildfires and extreme heat has created conditions that put even healthy individuals at risk,” said Dr. Afif El-Hasan, an association spokesman. “The ongoing COVID-19 pandemic only makes these potential effects more serious.”

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