WHO reveals over 90% of world breathing bad air

"It is a public health emergency," she said.

"Fast action to tackle air pollution can't come soon enough," she added, urging governments to cut the number of vehicles on the road, improve waste management and promote clean cooking fuel.

Tuesday's report was based on data collected from more than 3,000 sites across the globe.

It found that "92 percent of the world's population lives in places where air quality levels exceed WHO limits".

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