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Pollution in Mexico City (DI01469)
Pollution in Mexico City (DI01468)
Pollution in Mexico City (DI01467)
Pollution in Mexico City (DI01466)
Pollution in Mexico City (DI01465)
Industrial power plant (DI01197)
Smog in Denver (DI00420)
Smoke from an oil refinery in Commerce City, Colorado (DI00419) Photo by Carlye Calvin
Smoke from an oil refinery in Roosevelt, Colorado (DI00418) Photo by Carlye Calvin
Polluted skies off the coast of Kuwait, 1991 (DI00414)
Industrial pollution (DI00404)
Air pollution over Boulder, Colorado (DI00398)
