NEET BIOLOGY

Detailed explanation-1: -Vehicle emissions, fuel oils and natural gas to heat homes, by-products of manufacturing and power generation, particularly coal-fueled power plants, and fumes from chemical production are the primary sources of human-made air pollution.

Detailed explanation-2: -Factories contaminate the air by blowing chemical vapors and smoke out through vents and smokestacks, and by burning waste in open dumps or incinerators. Exhaust from generators, diesel trucks, and buses also fill the air with dangerous gases.

Detailed explanation-3: -According to the Academy of Medicine, cigarette smoke is one of the biggest pollutants found indoors, because it is full of harmful particles. To give you an idea, if you smoke 3 cigarettes, in 30 minutes you emit 10 times more harmful particles than an idling diesel engine.

Detailed explanation-4: -In Indian cities, a major part of air pollution is sourced, all year around, from burning of diesel, petrol, gas, coal, biomass, and waste and resuspended dust.