One of the main causes of air pollution in cities is emissions from vehicles like cars and trucks Ca...........

Geography and Environment (NDA) Environment

One of the main causes of air pollution in cities is emissions from vehicles like cars and trucks. Cars emit various pollutants which are bad for human health when inhaled, like

1.nitrogen oxides (NO_x ) 2. carbon monoxide (CO)

3.carbon dioxide (CO₂ ) 4. benzene

Which of the above pollutants are not tolerated by human being even at very low level?

1 and 4

1 and 2

1, 2 and 3

1, 2 and 4

Explanation:

NO_x (nitrogen oxides), CO (carbon monoxide), benzene are main sources of air pollution. Nitrogen oxides has a characteristic sharp, bitting odour. CO is yet non-irritating gas and benzene has aromatic, gasoline like odour which can’t be tolerated even at very low level can be lethal at higher concentration.