EVERYDAY SCIENCE

Detailed explanation-1: -Biological pollutants include bacteria, viruses, and parasites that are responsible for waterborne diseases, such as typhoid fever, cholera, dysentery, polio, hepatitis, and schistosomiasis. The presence of Coliform bacteria is indicator of recent fecal pollution.

Detailed explanation-2: -What are biological pollutants? Common indoor biological pollutants are: bacteria, molds, viruses, animal dander and saliva, dust mites, cockroach parts, and pollens.

Detailed explanation-3: -Contaminated water can harbor bacteria, such as those responsible for diarrhea, cholera, dysentery, typhoid, hepatitis A, and polio. According to the UN, every year, approximately 297, 000 children under five die from diseases linked to poor sanitation, poor hygiene, or unsafe drinking water.

Detailed explanation-4: -Sewage Pollution When untreated wastewater (soaps, detergents, toilet paper, cooking oil, human waste) from urban regions is discharged into a water body such as a river, lake, stream, ocean, or bay.