WHO describes air pollution as single largest environmental health risk . The majority of the deaths associated with air pollution were heart disease , stroke , chronic obstructive pulmonary disease and lung cancer . Asian countries hardest hit by outdoor and indoor air pollution . Out of 1 million deaths linked with pollution are heart disease , stroke , lung disease .
WHO describes air pollution as single largest environmental health risk . Asian countries hardest hit by outdoor and indoor air pollution . Out of 1 million deaths linked with pollution are heart disease , stroke , lung disease .