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Over in the Greater LA region, summers are smoggy while winters have very clean air. Summers are smoggy because it hardly rains a drop all summer long.
East Texas, and... we have no smog season, really.
Up in the Bay Area, late summer was smog season, but it rarely got too bad. They rarely put out a transit/carpool alert. But that was almost 15 years ago.
Generally summer in Oklahoma and North Carolina. But air pollution usually isn't as bad in Oklahoma because there are fewer people and it's generally windier. There can be smoke in Oklahoma from fires in winter or spring, however.
Neither Fort Worth Texas nor Indianapolis Indiana are really known for smog per se, yet both metros can and often do have “knozone action days” during spring and especially summer.
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