TOP 9 MOST POLLUTING COUNTRIES

The World Health Organization evaluated theconcentration of PM2.5 particles to determine the mostpolluted place on Earth. PM2.5 (fine particulate matter2.5) refers to tiny particles or droplets in the air that aretwo and one-half microns or less in width. Theseparticles come from car, truck, bus, and off-road vehicleexhausts and from operations that involve the burningof fossil fuels such as wood, heating oil, or coal. Theycan also originate from indoor sources such as smokingtobacco, cooking, burning candles or using fireplaces.PM2.5 is an air pollutant that is a concern for people’shealth when levels in the air are high. These particlesreduce visibility and make the air appear hazy whenlevels are elevated. Some cities, such as New York, issuea PM2.5 Health Advisory when conditions areconsidered to be unhealthy for sensitive groups.