Exposure to toxic air both indoors and out kills some 600,000 children under the age of 15 each year, the World Health Organization warned Monday.

Data from the UN health body shows that every day, 93 percent of children under the age of 15—a full 1.8 billion youngsters, including 630 million under the age of five—breath dangerously polluted air.

This has tragic consequences: In 2016 alone, some 600,000 children died from acute lower respiratory infections caused by polluted air, the WHO report found.

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