1. smoke from vehicles using the engine fire, smoke and gas. 2 poison from industrial 3. Origin of dust accumulation of 4 . source sewage 5. smoke from a burning cigarette from burning forest and farm.
One. Fumes from the vehicles engine. 2. Smoke and toxic gases from industrial plants. 3. Various sources of dust. 4. Sources of sewage sludge. 5. Smoke from burning fields and forests burning cigarette.
1. Smoke from vehicle engines use 2. Smoke and poisonous gas from industrial 3.? The source of dust in various pile of sewage source 4 . 5. The smoke from forest fires burn farm and from cigarettes.