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 (NOx) 2. Carbon monoxide (CO) 3. Carbon dioxide (C02) . 4.

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Q: 10 (NDA-I/2016)
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 (NOx)
2. Carbon monoxide (CO)
3. Carbon dioxide (C02) .
4. Benzene
Which of the above pollutants are not tolerated by human beings even at very low levels ?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,71,114,15,18,80,72

keywords: 

{'air pollution': [5, 0, 0, 3], 'various pollutants': [0, 0, 0, 1], 'above pollutants': [0, 0, 0, 1], 'emissions': [2, 0, 3, 6], 'carbon monoxide': [3, 0, 1, 1], 'carbon dioxide': [2, 0, 5, 6], 'cars': [0, 0, 5, 5], 'benzene': [1, 0, 7, 3], 'nitrogen oxides': [0, 0, 0, 1], 'human health': [0, 0, 0, 3], 'vehicles': [0, 0, 1, 8], 'main causes': [0, 0, 0, 1], 'cities': [2, 1, 1, 1], 'human beings': [4, 1, 0, 2]}