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Summary
DescriptionMost Polluted Cities in the United States by Annual Count of Days Violating Ozone Thresholds 1996-2016.png
English: A graph of the top ten most polluted cities in the US, eight of which are in California. The blue bar represents the highest annual number of days the city violated pollution requirements during the period 1996-2006, while the orange bar represents the lowest annual number of days violating requirements.
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