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Vintage Photos of the US Show What American Cities Looked Like Before Pollution Had to Be Regulated
Here are vintage photos that reveal ... pollution filled the air with thick smoke, as seen in this photo of the Clark Avenue Bridge. The city’s lack of pollution control turned empty lots ...
BBC23d
The far-reaching impacts of wildfire smoke – and how to protect yourself
Getty Images Hazardous air pollution levels in cities contributes ... If there is a wildfire nearby, the Centers for Disease Control and Prevention advise taking steps to limit your exposure ...
As wildfire smoke chokes LA, see how many-bad air days your county had
Major air pollutants have declined in recent decades, but USA TODAY’s analysis shows wildfire smoke is taking their place.