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TRAFFIC POLLUTION. Rio de Janeiro, Brazil, South America. Heavy traffic in Rio de Janeiro, Brazil's capital. Traffic congestion and high pollution levels cause illness. The most visible consequences of air pollution is smog, the effects of this environmental problem are more devastating than what simply meets the eye. Breathing in these chemicals daily is damaging the body causing serious health problems to people and especially children and babies. Asthma attacks can be triggered by high levels of air pollution. The health condition asthma can also be caused by air pollution. asthma attacks set off by pollutants are one of the largest causes of air pollution related death  in America