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Atmosphere of big cities is polluted most bya)Automobile exhaustsb)Radioactive fall outc)Household wasted)Pesticide residueA. automobile exhaustsB. pesticide residueC. household wasteD. radioactive fall-out

Answer» Correct Answer - A
Automobile exhausts are the largest source of air pollution in big cities. Automobiles releases carbon monoxide (77.2%), hydrocarbons (13.7%) and nitrogen oxide (7.7 %).


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