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Heavy traffic (DI01698)
Effects of paved surfaces on pollution build-up (DI02468) Illustration by Lex Ivy
Pollution: forest fires (DI00386)
Burning oil wells in Kuwait, 1991 (DI00416)
Burning oil wells in Kuwait, 1991 (DI00409)
Pollution along lower Yangtze River (DI01897) Photo by William Bradford
Acid Rain Damage (DI01205)
Smog in Denver (DI00420)
Pollution: forest fires (DI00387)
Factory smoke oil refinery, Commerce City, Colorado (DI00419), Photo by Carlye Calvin
Landfill (DI00392), Photo by Carlye Calvin
Beach debris (DI00393), Photo by Carlye Calvin
Pollution in Mexico City (DI01461)
Pollution: Contributors to Denver's Brown Cloud (DI00397)
Heavy traffic (DI01702)
Pollution in Mexico City (DI01472)
Pollution: biomass burning (DI00047), Photo by Patrick Zimmerman
Forest fire haze (DI00385), Photo by Carlye Calvin
Pollution in Mexico City (DI01469)
Pollution in Mexico City (DI01468)

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