Comment on Most Polluted Cities in the U.S.parentComments−justinludwig3yIt's the smoke from the annual forest fires of late summer and early fall throughout the West Coast. That smoke makes for really high individual 24-hour readings, plus ends up skewing the annual averages as well.
Comments
It's the smoke from the annual forest fires of late summer and early fall throughout the West Coast. That smoke makes for really high individual 24-hour readings, plus ends up skewing the annual averages as well.