Question

The term brown air is used for:

Answer 1

1. Brown air is another name for photochemical smog, which is mostly made of ozone (${\mathrm{O}}_3$), peroxyacetyl nitrate (PAN), and NO_x in areas with high solar radiation.
2. Actually, the "brown air" is a layer of air pollution made up of several dangerous aerosols.
3. Excessive pollution and deforestation are the causes of this brown air release.