The L.A. area is the smoggiest region in the nation, again. The American Lung Association has given failing air-quality grades to L.A. and several other cities for the 25th year in a row.

Photo: Getty Images

<p>The L.A. area is the smoggiest region in the nation, again. The American Lung Association has given failing air-quality grades to L.A. and several other cities for the 25th year in a row.</p>
<p>Photo: Getty Images</p>

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