Midday in Pittsburgh, PA - I lived in Pgh in the early and it was much the same. Mom would dust and 20 minutes later everything would be covered with soot from the steel mills. No more soot now - no more steel mills.
Chimneys of a cement plant emit smoke into the air in Binzhou, in east China's Shandong province. Air pollution is a major problem in China due to the country's rapid pace of industrialisation, reliance on coal power, explosive growth in car ownership and lack of environmental regulation. It typically gets worse in the winter because of weather conditions and an increase in coal-burning for heating needs Photograph: Zhang Bin/EPA
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