Pollution and environmental hazards like dirty water continue to amass a staggering yearly death toll, mostly in the developing world, according to a new analysis by the World Health Organization.

Some 1.7 million children under the age of 5 died from preventable causes, according to two new reports, made up of multiple data sets and international estimates for the year 2015.

The main drivers of the 2015 death toll were related to disease caused by unsafe surroundings.

Some 570,000 are killed through respiratory infections like pneumonia, which are caused by both indoor and outdoor air pollution, and even second-hand smoke.

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