The Hearty Soul on MSN4mon
Vintage Photos of the US Show What American Cities Looked Like Before Pollution Had to Be RegulatedIn the era before ... pollution. A boy throws a Frisbee against the backdrop of hazy skies caused by emissions from the North ...
According to China Daily, readings of PM 2.5 dropped by 11% in 2014, though it's clear from the still lingering heavy pollution days (like this one in October 2014) that China still has a long way ...
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