Air pollution kills about 7 million people worldwide every year, with more than half of the fatalities due to fumes from indoor stoves, according to a new report from the World Health Organization published Tuesday.

The agency said air pollution is the cause of about one in eight deaths and has now become the single biggest environmental health risk.

WHO estimated that there were about 4.3 million deaths in 2012 caused by indoor air pollution, mostly people cooking inside using wood and coal stoves in Asia. WHO said there were about 3.7 million deaths from outdoor air pollution in 2012, of which nearly 90 percent were in developing countries.

WHO’s report noted women had higher levels of exposure than men in developing countries.

Other experts said more research was needed to identify the deadliest components of pollution in order to target control measures more effectively.

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