(CNN.COM) Meera Senthilingam, March 6, 2017 — Each year, environmental pollutants cost an estimated 1.7 million lives among children under 5, according to World Health Organization reports released Monday.

The causes include unsafe water, lack of sanitation, poor hygiene practices and indoor and outdoor pollution, as well as injuries.

The new numbers equate to these pollutants being the cause of one in four deaths of children 1 month to 5 years old.

Source: Polluted environments kill 1.7 million children each year, WHO says – CNN.com