Environment › Pollution
Water pollution and river rejuvenation
Polluted rivers and lakes and what cleans them: sewage treatment and reuse, industrial effluent, contaminants in drinking water, and the programmes that rejuvenate rivers. Prelims has asked what biological oxygen demand measures and which pollutants are found in drinking water in parts of India.
UPSC has asked
- Prelims 2017: what biological oxygen demand is a standard criterion for
- Prelims 2013: pollutants found in drinking water in parts of India
No subject here changed from 1 to 15 September 2026.Show all
Also filed elsewhere
- Fluorosis · on Non communicable diseases, nutrition and food safety
Fluorosis is not a poisoning that arrives from a factory: the fluoride is in the rock the groundwater passes through, so a village can drink it for years with nothing having gone wrong upstream.