Chemistry
Sullage water is –

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

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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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