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Air pollution.

Air pollution occurs when harmful or a large quantity of substances including gases, particulates, are introduced into Earth's atmosphere.  Pollution emitting from vehicles including trucks, jeeps, cars, trains, airplanes cause an immense amount of pollution. Smoke from factories is another cause. 

Air pollution poses a major threat to health and climate. It causes about seven million deaths every year, largely as a result of increased mortality from stroke, heart disease, chronic obstructive pulmonary disease, lung cancer and acute respiratory infections. It also kills animals and living conditions day by day. To tackle the problem, we should conserve energy by switch off fans and lights when you are going out,  use public mode of transportation and do not throw away items that are of no use to you.