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...because not everywhere has BAD air...and most of those places that do, it's more often due to geophysical (basin) characteristics and weather (inversions), and NOT always cars and hydrocarbon emissions!
For example, EPA keeps beating AZ up about it's DUST storms as if the residents are responsible for (a) blowing winds, (b) desert sands, and (c) weather conditions causing those winds! Duh!
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