Indoor pollution may occur in many ways like:-
1)Listening to music at very high sound can cause indoor noise pollution.
2)While making food if there is not any exhaust so it leads to air pollution.
3)When there is a leakage in the sewer pipe it may lead to water and land pollution as the sewage would leak from the pipes.
4)The AC's we use at our homes if contains CFC then the release of CFC could cause pollution by breaking of ozone layer.