Using data from over 6,000 cities, the World Health Organization estimates that about 99 percent of the global population lives in an area with harmful air.
The data was measured in over 6,000 cities that monitor air quality, across 117 countries. People from lower-income nations, on average, experience more harmful air, a new WHO report says.
In the 117 countries monitoring air quality, just 17 percent of the cities in high-income countries have air quality below the WHO's guidelines for"particulate matter," the report said. But an estimated 99 percent of cities in low- and middle-income countries have air quality below the guidelines. The update includes nitrogen dioxide, a"common urban pollutant," for the first time. NO2 also serves as a precursor to other particulate matter pollutants and is frequently produced by human activity, the report said.
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