Indoor and outdoor air quality in San Francisco (IMAGE)

University of California - Berkeley

Indoor and outdoor air quality in San Francisco

Caption

The Air Quality Index across the San Francisco Bay Area measured by crowdsourced PurpleAir sensors on Aug. 28, 2021, when wildfire smoke made air quality unhealthy in much of the region. On the whole, the AQI measured by outdoor sensors (right) was higher than indoor sensors (left), indicating that many residents are successfully taking action to reduce smoke exposure indoors.

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