Pollution is one of the major ecological problems that occurs within the region. Many automobiles were then imported into Mexico City and soon the city was flourishing with business and an evergrowing population. With the economic success of this city came many environmental costs; one of the issues that corresponded with industry in Mexico City was pollution. As stated previously, Mexico City is surrounded by mountains and is located in a low elevation region. These mountains and low elevation included with low winds cause Mexico City is trap in smoke and pollutants that go into the air from factories, automobiles and homes. The air then becomes thick because of all the pollutants that usually disperse with wind, however, the wind rebounds from the mountains and the air then goes back from where it started. This causes pollution. Mexico City wanted to continue growing rapidly so plans to deal with pollution were never made until recent years. Policies such as "A day without a Car" are enforced so that once a week a family cannot use their car to decrease CO2 emissions. Many of the citizens of the region felt the effect of pollution because reports of people with asthma increase ever year.
Mexico City's pollution level was 97.5, compared to 4.5 for New York City, and 2.5 for Milan, Turin, and Los Angeles.
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