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Forest in Mexico (DI01206)
Oil drilling in ocean (DI00736), Photo by Charles Meertens
Landfill (DI00392), Photo by Carlye Calvin
Beach debris (DI00393), Photo by Carlye Calvin
Forest fire haze (DI00385), Photo by Carlye Calvin
Pollution in Mexico City (DI01470)
Air pollution, Mexico City (DI01871)
Air Pollution over Boulder, Colorado (DI00394)
High pollution day (Denver, CO) (DI00390), Photo by Carlye Calvin
Pollution: forest fires (DI00388)
Pollution in Mexico City (DI01468)
Pollution over Denver, Colorado (DI00396)
Air pollution over Boulder, Colorado (DI00391)
Pollution: forest fires (DI00387)
Pollution in Mexico City (DI01466)
Pollution: Contributors to Denver's Brown Cloud (DI00397)
Pollution: forest fires (DI00386)
Air pollution, Mexico City (DI01872)
Pollution in Mexico City (DI01472)
Industrial pollution (DI00404)

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