Air pollution is a major environmental risk to (1.)_______________. if not reduced, it can lead to serious health problems such as stroke, heart disease, lung cancer and other (2.)_______________ problems. according to (3.)_______________, around 7 million (4.)_______________ are due to exposure from both outdoor and (5.)_______________ air pollution. it was estimated that countries from the southeast asia and (6.)_______________ regions are most likely to be affected with over (7.)_______________ million deaths.