Chemistry
Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called

Smoke
Mists
Fumes
Aerosols

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Chemistry
Photo chemical smog is a resultant of the reaction among

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

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