Air Pollution in India — UPSC Environment Notes

Air pollution kills more Indians each year than tobacco, alcohol, and road accidents combined. The State of Global Air 2024 report attributes over 2 million premature deaths in India annually to air pollution, and 39 of the world's 50 most polluted cities are Indian. Delhi's winter smog is only the most visible face of a nationwide crisis driven by transport, industry, biomass burning, construction, and agricultural residue burning. For UPSC, this is a perennial GS-III topic with many sub-themes.

Sources of air pollution

Delhi-NCR — a meteorology-sensitive basin

• Reduced wind speeds in winter trap pollutants.
• Temperature inversion stops vertical dispersion.
• Farm fires in Punjab-Haryana (late October-November) add to a high baseline.
• Geographical bowl of the NCR compounds stagnation.

Key pollutants — quick reference

Impacts

• Health — CSE estimates India's life expectancy is 2.6 years shorter because of air pollution; AQLI (Chicago) puts it closer to 5 years for polluted basins.
• Economy — USD 150+ billion/year (~5% of GDP) in disease, premature death, welfare loss.
• Climate — black carbon is a short-lived climate forcer; NOx and ozone alter radiative balance.
• Crops — ozone and PM reduce wheat and rice yields.
• Wildlife — alters plant physiology and breeding behaviours.

Key initiatives

National Clean Air Programme (NCAP), 2019

• MoEFCC-led national programme.
• Original target: 20-30% reduction in PM2.5 and PM10 by 2024 (base 2017); revised to 40% reduction by 2025-26.
• Covers 131 non-attainment cities (up from 102).
• XV Finance Commission allocated Rs 4,400+ crore for 42 million-plus cities; Rs 2,217 crore for 82 other cities over 5 years.
• Prana portal for monitoring action plans.

Commission for Air Quality Management (CAQM), 2021

• Statutory body covering NCR and adjoining areas.
• Replaced the ad hoc EPCA.
• Directions are binding across Delhi, Haryana, Punjab, Rajasthan, UP-NCR.

Graded Response Action Plan (GRAP)

Four-stage emergency response:

Fuel and vehicle standards

• BS-VI from 1 April 2020 — skipped BS-V entirely.
• Pet-coke and furnace oil ban in NCR (2017).
• Ethanol blending — E20 target advanced to 2025-26.

Clean cooking fuel

• Pradhan Mantri Ujjwala Yojana (PMUY) — over 10 crore LPG connections to below-poverty-line households (2016 onward).

Industrial controls

• 24×7 online emission monitoring in 17 heavily polluting industries.
• National Air Quality Index (NAQI) — launched 2014; 6 categories from Good to Severe.
• National Ambient Air Quality Standards (NAAQS) — last revised 2009; WHO's 2021 guidelines are tighter (India under review).

Specific Delhi measures

• Odd-even scheme (2016, 2017, 2019).
• Smog towers at Connaught Place and Anand Vihar.
• Anti-smog guns on construction sites.
• Dust mitigation plans mandatory for sites >500 sq m.

Stubble (paddy residue) burning

Why it happens

• Combine harvesters leave tall stalks that must be cleared fast.
• Punjab Preservation of Subsoil Water Act, 2009 (and Haryana's equivalent) delayed paddy sowing to conserve groundwater — but shrank the window to clear fields for wheat.
• High silica content in paddy straw makes it unfit for fodder.
• Cheapest option remains setting fire.

Solutions

• Pusa Bio-Decomposer (IARI) — in-situ residue decomposition.
• Happy Seeder, Super Straw Management System (SMS), Surface Seeder — mechanical alternatives.
• Ex-situ use — biomass pellets, cardboard, bio-ethanol, power co-firing with coal.
• Cash incentives to non-burning farmers (proposed).

Indoor air pollution

Often overlooked but a major killer, especially among women and children in rural India:

• ~500 million Indians still use solid fuels (firewood, dung, crop residue) for cooking.
• Global Burden of Disease estimates indoor air pollution kills ~0.8 million Indians annually.
• Ujjwala Yojana and AGNI scheme aim to transition these households to LPG/clean fuels.

Latest developments (2024-26)

Updated context: figures evolve; check MoEFCC and CPCB annual updates.

• NCAP revised target (2023) — 40% PM reduction by 2025-26.
• CAQM tightening measures — 2024 winter saw GRAP Stage IV invoked multiple times.
• Stubble burning — 2024 saw fewer Punjab fire counts but Haryana numbers remained high; debate around Air Quality Commission/Lok Sabha Committee report ongoing.
• BS-VI second stage (RDE) — real-driving emissions phase operational.
• Sovereign Green Bonds proceeds partly channelled to NCAP projects.
• CPCB AQI upgrade — expansion of real-time monitoring network from ~300 to ~1,500 stations targeted by 2026.
• COP29 — methane commitments from agriculture and waste sectors.

UPSC relevance

GS-III mapping

Directly covers "pollution" under conservation and environmental degradation.

Prelims bullets

• NAAQS parameters: 12 pollutants (PM10, PM2.5, SO2, NO2, CO, O3, NH3, benzene, Pb, BaP, As, Ni).
• NCAP launched in January 2019.
• CAQM Act, 2021 replaced EPCA.
• GRAP has 4 stages.
• BS-VI rolled out on 1 April 2020.
• India AQI — 6 categories; scale 0-500.
• SAFAR — System of Air Quality and Weather Forecasting (by IITM, Pune).

Mains angles

• “Delhi’s winter air pollution is the outcome of agricultural policy, urban planning, and meteorology. Critically examine.”
• "Evaluate the achievements and limitations of the National Clean Air Programme."
• "Discuss the governance architecture for air quality management in the NCR."

Essay hooks

• The right to clean air as a constitutional right (Article 21).
• Cooperative federalism in air pollution — an unfinished project.
• Health as the silent victim of development.

Quick revision

For UPSC, the consistent narrative is: India has one of the world's most extensive air quality regulatory architectures on paper — NCAP, CAQM, BS-VI, GRAP — yet the gap between norms and outcomes remains wide. Closing it requires cooperative federalism, agricultural diversification, urban design, and political will.