Pollution
Key facts
- CPCB AQI 101-200 is Moderate; this is a high-frequency measurement anchor.
- Water Act 1974, Air Act 1981 and Environment Protection Act 1986 form the statutory ladder.
- Solid Waste Management Rules, 2026 mandate four-stream source segregation and strengthen municipal and bulk-generator duties.
- BS-VI from 1 April 2020 tightened vehicle-emission governance.
Key Points at a Glance
- 1
Pollution questions usually combine source, pollutant, indicator, law and control measure.
- 2
CPCB AQI 101-200 is Moderate; this is a high-frequency measurement anchor.
- 3
Water Act 1974, Air Act 1981 and Environment Protection Act 1986 form the statutory ladder.
- 4
Stockholm, Minamata, Basel, Montreal and MARPOL map to different pollutant families.
- 5
Sulphur dioxide and nitrogen oxides are the classic acid-rain precursor pair.
- 6
Solid Waste Management Rules, 2026 mandate four-stream source segregation and strengthen municipal and bulk-generator duties.
- 7
BS-VI from 1 April 2020 tightened vehicle-emission governance.
- 8
Jaipur, Bhiwadi and Sambhar provide Rajasthan hooks for city air, industry and inland water.
What is pollution as a measurable environmental pressure?
Pollution is a measurable environmental pressure in which an undesirable change in air, water, soil, noise or radiation conditions harms health, ecosystems or materials.
Pollution is measured because examination answers need more than a general complaint about dirty surroundings: they need a pollutant, a medium, a source, an effect and, where possible, a standard or index. According to the Central Pollution Control Board's National Air Quality Index document, the AQI band 101-200 is classified as Moderately polluted.
Pollutant Types and Measures
| Item | Category / Unit | Key Detail |
|---|---|---|
| Sulphur dioxide from fuel combustion | Primary pollutant example | A pollutant can be primary, such as sulphur dioxide from fuel combustion. |
| Ground-level ozone formed through sunlight-driven reactions | Secondary pollutant example | A pollutant can be secondary, such as ground-level ozone formed through sunlight-driven reactions. |
| Particulate matter | PM10 and PM2.5 | Particulate matter is tracked as PM10 and PM2.5. |
| Water clarity | Turbidity in nephelometric turbidity units | Water clarity can be expressed through turbidity in nephelometric turbidity units. |
| AQI range 101-200 | Moderately polluted category | The Central Pollution Control Board air-quality scale places the AQI range 101-200 in the Moderately polluted category, a recurring measurement anchor for Indian city questions. |
Rajasthan Lens
- Jaipur under NCAP is monitored through a clean-air action frame.
- Bhiwadi industrial air pollution issue shows how industrial fuel, dust and transport sources can combine in an NCR-linked cluster.
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PREDICTED Predicted RAS Questions
Based on PYQ trends and 2026 syllabus analysis
1 MCQ According to the Indian air-quality category scale, the range 101-200 belongs to which category?
Explanation
Moderate is correct because CPCB's AQI category table places 101-200 in that band. Good is 0-50, Very Poor is 301-400, and Severe is above 400.
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