Chemistry
Carbon footprint can be reduced by

Commuting by public transport
Using energy efficient appliances
All of these
Recycling waste materials

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

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