Chemistry
The major harmful gas emitted by automobile vehicle which causes air pollution is

Carbon Monoxide
Carbon dioxide
Ozone gas
Methane

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Chemistry
An oxidising agent is a

In a chemical reaction its oxidation number increases
An electron donor
An electron acceptor
It releases H2 in a chemical reaction

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Chemistry
Photo chemical smog is a resultant of the reaction among

CO, O2 and peroxy acetyl nitrate in the presence of Sunlight
CO, CO2 and NO2at low temperature
NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight
High concentration of NO2, O3, and CO in the evening

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