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Commuters ride a crowded bus in July. Lima has a new rapid transit bus system powered by natural gas, but an older fleet of buses spewing air pollution hasn't gone out of service yet. Air pollution in the capital exceeds World Health Organization limits ninefold. (Associated Press)

Commuters ride a crowded bus in July. Lima has a new rapid transit bus system powered by natural gas, but an older fleet of buses spewing air pollution hasn't gone out of service yet. Air pollution in the capital exceeds World Health Organization limits ninefold. (Associated Press)

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