11 Worst Countries for Air Pollution

Air has gotten cleaner in recent years. But more than half of people in the U.S. still breathe air dirty enough to cause health problems, according to an American Lung Association (ALA) report. "There is always going to be a dirtiest city," says Joel Kaufman, MD, director of the Occupational and Environmental Medicine Program at the University of Washington, in Seattle. Here are the 11 worst countries for air pollution according to Insidermonkey experts.

The World Health Organization (WHO) released its 2014 report into global air pollution with some concerning finds. The database looked at the air pollution levels of 1600 cities across 19 countries by using a reading called PM2.5 and PM10. PM2.5 is considered the best indicator of assessing health impacts from air pollution and examines the concentration of fine particulate pollution of 2.5 micrometers or less in diameter (PM2.5). These particles might be smoke, dirt, mold or pollen and their fine size poses the biggest risks to human health as they can be inhaled and accumulated in the respiratory system. WHO says there is no safe level of PM2.5. You can also read the worst cities for people with asthma in America.

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