Only high blood pressure, poor diet, and cigarettes kill more people every year than air pollution. 85% of the world's population lives in areas that exceed the WHO's safe level of air pollution, says a scientist. 188 the number of countries got effected during 1990 and 2013 due to air pollution.
Future - Scientists warn the early death toll will climb over the next 20 years unless the world does more to fight the problem.
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