Chemistry
The constituents of automobile exhaust that can cause cancer is/are :

Lead
Oxides of nitrogen
Carbon monoxide
Polycyclic hydrocarbons

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Chemistry
Photo chemical smog is a resultant of the reaction among

CO, CO2 and NO2at low temperature
CO, O2 and peroxy acetyl nitrate in the presence of Sunlight
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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