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An air quality advisory is in effect for the Bay Area on Friday, as smoke from wildfires burning in far Northern California ...
The poor air quality is, in large part, due to particulate matter, known as PM2.5, released from smoke, fire and other sources of pollution such as power plants, cars and trucks.
Wildfire smoke is still impacting the air quality in Western Colorado. Temperatures will also be hot, but rain is possible later in the week.
When air quality is ranked "unhealthy for vulnerable groups" it means PM 2.5 are at levels that can cause problems for people ...