UNITED NEWS INTERNATIONAL (UNI) — A new report reveals nine out of 10 people around the world breathe polluted air.

This pollution — both indoors and out — reportedly kills 7 million people every year.

More than 90 percent of these deaths take place in low- and middle-income countries mostly in Asia and Africa.

These statistics are part of the largest-ever survey on air pollution in cities released May 2 by the World Health Organization.

The report analyzed levels of two air pollutants: PM10 and the more deadly PM2.5.

It found New Delhi tops the list for highest levels of PM10, followed closely by Cairo.

Indian cities made up 14 of the top 15 with the highest levels of PM2.5. The northern city of Kanpur was the worst, with levels 17 times higher than the WHO’s safe limit.

The WHO’s report concludes that wealthy nations are improving their air quality while poor nations are falling further behind.