Chemistry
Photo chemical smog is a resultant of the reaction among

High concentration of NO2, O3, and CO in the evening
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

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Chemistry
Sullage water is –

Waste water released from hospitals
Waste water released from factories
Waste water released from kitchen
Waste water released from toilets

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