Chemistry
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of

Unburnt petrol
SO2
CO2
CO

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Chemistry
What are the components responsible for acid rain?

Oxides of carbon (COx) and Oxides of nitrogen (NOx)
Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
Nitrogen monoxide (NO) and Carbon monoxide (CO)
Carbon dioxide (CO2) and Carbon monoxide (CO)

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