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Africa and Asia were the worst affected.
Antara Foto Agency / Reuters
The pollution has put northern China on red alert.
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And more than 500,000 of them are dying each year as a result, according to a new UNICEF report.
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Levels of acid in the atmosphere have fallen almost to preindustrial levels.
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Air pollution may have caused more than 100,000 deaths last year, a new study finds.
The nanoparticles formed during combustion possibly contribute to Alzheimer's disease.
For years, the Brazilian city has surpassed international limits for a dangerous air pollutant.
Antara Photo Agency / Reuters
Poor air quality is now the fourth largest threat to our health, according to a new IEA report.
Aly Song / Reuters
Here's more evidence that air pollution is a major global health problem.
Dirty air kills some 3 million people worldwide each year.
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NASA is celebrated for space probes and Mars missions. But one of the agency’s next big projects could also make a major contribution to public health. The U.S. space agency, along with agencies in E...
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