Top 15 Dirtiest Cities in The World

08 Mexico City, Mexico

Mexico City, the capital of Mexico. Its Mercer Health and Sanitation Index Score is 37.7. The capital of North American air pollution estimates unhealthy ozone emissions nearly 85% of the year. Mexico’s geographical location is in the center of a volcanic crater and surrounded by mountains. Only serves to lock in the air pollution, causing smog to sit above the city.

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