Topic: Air pollution (page 6)

(elwynn/Shutterstock)

(balu/Shutterstock)

Severe air pollution on February 25, 2014 in Beijing, China (Hung Chung Chih / Shutterstock)

(constantinks/Shutterstock)

(paul prescott/Shutterstock)

(axz700/Shutterstock)

(victorass/Shutterstock)

Cracking down on gasoline

(Reinhard Tiburzy/Shutterstock)

(Screenshot, The Weather Channel)

Texas's toxic air

A woman cooking chapatis in oil to make pancakes, on February 4, 2013 in Delhi, India. (africa924/Shutterstock)

Tom Corbett (AP/Manuel Balce Ceneta)

(Kodda/Shutterstock)

East Coast vs Midwest

(J. Helgason/Shutterstock)

(yasithaphoto/Instagram)

(Natural Resources Defense Council)

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