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By Brian Mastroianni

The numbers are sobering -- more than 5.5 million people die prematurely each year as the result of household and outdoor air pollution, according to new research presented Friday at the 2016 annual meeting of the American Association for the Advancement of Science (AAAS).

What areas are most at risk? The study found more than half of these deaths occur in China and India, two of the world's fastest-growing economies.

...This work is an extension of the broader Global Burden of Disease Study, which is spearheaded by the Institute for Health Metrics and Evaluation at the University of Washington. That study analyzed health and risk factors such as air pollution that impacted 188 countries between 1990 and 2013.

Read the article on CBSNews.com.