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File: airnow-november-1--november-16--2018.jpg

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Alternate Text: screenshot of EPA air quality maps from the AIRNOW website
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screenshot of EPA air quality maps from the AIRNOW website

Image caption

Screenshots from the EPA AirNow website, showing maps of air quality on November 1 (left) and 16 (right), a day on which smoke from the Camp Fire created high pollution levels over the San Francisco area of California. Images courtesy EPA AirNow archive.