Causes of water pollution

There are several classes of common water pol-lutants. These areĀ  disease-causing agents (pathogens) which include bacteria, viruses, protozoa and parasitic worms that enter water from domestic sewage and untreated human and animal wastes. Human wastes contain concen-trated populations of coliform bacteria such as Escherichia coli and Streptococcus faecalis. These bacteria normally grow in the large … Read more

Types and sources of Air Pollution

Air pollution occurs due to the presence of undesirable solid or gaseous particles in the air in quantities that are harmful to human health and the environment. Air may get polluted by natural causes such as volcanoes, which release ash, dust, sulfur and other gases, or by forest fires that are occasionally naturally caused by … Read more

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