Q. Brown haze produced in photochemical smog is due to:

 42  147 NTA AbhyasNTA Abhyas 2022 Report Error

Solution:

Photochemical smog is initiated by the photochemical dissociation of and the resulting secondary reactions involving unsaturated hydrocarbons, other organic compounds and free radicals, leading to the formation of organic peroxides and ozone.
Solution
Hydrocarbons ; peroxides, peroxyacetyl nitrate, formaldehyde, ozone aldehyde, acrolein, etc. oxidised hydrocarbons and ozone in the presence of humidity cause photochemical smog, which dissipates at night.