Changes Around Us. — Science STD 8 — Question

Generally, there are three types of pollutions viz air, water, and land pollution. Due to increasing human activities lot of chemical substances are produced artificially which harms all the living and non – living things.
Types of chemical substances and their effects:

S. No	Type of pollution	Chemical substances responsible for the pollution	Effects
1.	Air pollution	Carbon dioxide, Carbon monoxide, oxides of sulphur, oxides of nitrogen, Chlorofluorocarbons, methane, etc.	Acid rain, Global warming, respiratory problems, etc.
2.	Water pollution	Waste water containing chemical substances (e.g dyeing industries), detergents, oil spillage, etc.	Decrease in quality of water, skin diseases, etc.
3.	Land pollution	Fertilizers like urea, various pesticides, herbicides, etc.	Spoilage of land, cancer, respiratory diseases, etc.