Question

What do you mean by polluted air? Mention the cause for the same

Answer 1

polluted air means air which is contained i.e. air which is not pure and full of pollutants.
CAUSES:
1- untreated smoke from factories
2- carbon dioxide emissions

Answer 2

the air present with unwanted or harmful materials like smoke,dust particles,etc. is called polluted air.
1. incineration of municipal solid wastes will cause air pollution.
2. not filtering the smoke produced in the factories and industries will cause severe air pollution.