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 ?

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]}

Option 1 states that nitrogen oxides (NOx) and benzene are the pollutants that are not tolerated by human beings even at very low levels. Nitrogen oxides can cause respiratory problems and contribute to the formation of smog. Benzene is a known carcinogen and can cause leukemia and other forms of cancer.

Option 2 states that nitrogen oxides (NOx) and carbon monoxide (CO) are the pollutants that are not tolerated by human beings even at very low levels. Carbon monoxide is a toxic gas that can cause headaches, dizziness, and in high concentrations, it can be fatal.

Option 3 states that nitrogen oxides (NOx), carbon monoxide (CO), and carbon dioxide (CO2) are the pollutants that are not tolerated by human beings even at very low levels. Carbon dioxide is a greenhouse gas that contributes to climate change, but it is not directly toxic to human health.

Option 4 states that nitrogen oxides (NOx), carbon monoxide (CO), and benzene are the pollutants that are not tolerated by human beings even at very low levels. This option correctly identifies the pollutants that are harmful to human health and should be avoided.

Therefore, the correct answer is option 4.