Condensed UPSC Environment-Pollution Notes (2025)

Air Pollution in India

• $6$ of world’s $10$ most-polluted cities in India; PM$2.5$ cuts North-Indian life expectancy ≈$8$ yrs; Increased risk of chronic respiratory diseases, cardiovascular diseases, and premature mortality. Exposure also linked to cognitive impairment and poor birth outcomes, significantly impacting public health. Studies show that air pollution is a leading cause of non-communicable diseases in India.
• Key sources – transport (vehicular emissions, particularly from older vehicles and diesel), coal TPPs (thermal power plants which are significant industrial emitters of SO$2$, NOx, and PM), biomass cooking (traditional cooking fuels used in rural areas), construction dust, waste & stubble burning (agricultural residue burning, especially in northern plains).
• Impacts: health (cardio-respiratory, pre-term birth), GDP loss ≈$7\%$ (due to healthcare costs and productivity loss), solar
-power yield drop (due to aerosol deposition reducing solar radiation), acid rain & haze (impacting ecosystems and visibility).
• 2024–25 policy focus: NCAP target – $40\%$ PM cut by $2026$ (National Clean Air Programme aims at reducing particulate matter concentrations); BS-VI fuel (Bharat Stage VI emission standards for vehicles, significantly cleaner fuel and engine technology); renewables (promotion of solar and wind energy to reduce reliance on fossil fuels); EVs (electric vehicles for reduced vehicular emissions); Ujjwala (LPG distribution scheme to reduce biomass cooking); Mission LiFE (Lifestyle for Environment focusing on sustainable living).

National Clean Air Programme (NCAP)

• Cover 132 non-attainment cities (cities that consistently fail to meet national ambient air quality standards); fund ₹$10{,}422$ cr (allocated budget for implementation); city Clean-Air Action Plans (tailored strategies for each non-attainment city).
• Initial $20\text{-}30\%$ PM cut target (base $2017$)
→ revised $40\%$ by $2026$ (indicating increased ambition).
• 2025 review: only $41/97$ cities met $20\%$ PM$10$ goal (highlighting slow progress); fund use $68\%$ (indicating challenges in utilization of allocated funds); monitoring gaps (insufficient or unreliable air quality monitoring infrastructure); legal backing & PM$2.5$ priority urged. Inadequate data quality, lack of political will, and a robust financial mechanism have hindered progress. Cities often struggle with multi-sectoral coordination and effective enforcement mechanisms.

Delhi & NCR Crisis

• Winter spikes: dust

vehicles
stubble (≈$25\%$ PM during Oct–Nov) + low wind & inversion (atmospheric conditions trapping pollutants). This combination creates severe smog events.
• Measures: CNG buses (compressed natural gas vehicles), GRAP (Graded Response Action Plan, an emergency action plan for declining air quality), BS-VI (emission norms), EV policy (electric vehicle promotion), odd–even (traffic rationing scheme), peripheral expressways (diversion of non-destined commercial traffic).
• Shortfalls: reactive actions (rather than proactive, long-term strategies), regional inflow (pollution from surrounding states, especially stubble burning), population & vehicle surge (increasing emission sources). Failure to implement long-term structural changes, reliance on emergency measures like GRAP, and significant challenges in controlling transboundary pollution from neighboring agricultural burning and industrial activities.

CAQM (Commission for Air Quality Management)

• Statutory (2021) body established under an Act of Parliament; jurisdiction – Delhi, Punjab, Haryana, UP, Rajasthan (overseeing air quality management in the National Capital Region and adjoining areas).
• Powers: coordinate, issue binding orders (enforceable directions to states and authorities), levy fine ₹$1$ cr/5 yr jail (penalties for non-compliance); overrides CPCB/SPCB in air matters (central/state pollution control boards, giving CAQM supreme authority in air quality management for its jurisdiction). Acts as an overarching body to plan, execute, and monitor pollution control measures across the region, consolidating previous multiple authorities to ensure unified action.
• Effectiveness hinges on implementation & state cooperation, as well as its capacity for strong enforcement and data-driven decision-making.

Stubble Burning

• Drivers: 15-day rice–wheat gap (short window between harvest of paddy and sowing of wheat), no straw market (lack of economic value for crop residue), cheap burning (the easiest and most economical method for farmers).
• Tools: Happy Seeder subsidy (machine for direct seeding into stubble without burning), Pusa decomposer (bio-solution to decompose crop residue), biomass/bio-CNG plants (utilizing stubble as raw material), crop diversification (moving away from rice-wheat cycle), MGNREGA for collection (using rural employment scheme for manual collection).
• Core need: make collection + alternatives financially better than fire, providing a sustainable economic incentive for farmers not to burn.

Pollutant Focus

• SO$2$: India = top emitter; >85\% from coal TPPs; FGD retrofit lag – only $39/537$ units by $2024$ (Flue Gas Desulphurization technology installation is significantly behind schedule). This delay significantly contributes to acid rain formation, respiratory illnesses, and haze in areas around coal-fired power plants.
• FGD cost ≈₹$1.2$ cr/MW but vital for acid-rain & health, and compliance with emission norms.
• Ammonia: Indo-Gangetic hotspot; fertiliser & sewage; Yamuna $<br>\ge 3$ ppm shutdowns (ammonia levels in Yamuna river causing treatment plant shutdowns). Elevated ammonia levels in rivers lead to eutrophication, algal blooms, and oxygen depletion, severely threatening aquatic life and making water unfit for consumption.
• Fly-ash: ash utilisation rules (1999–2021); uses – PPC cement, bricks, roads; legacy-ash removal (managing existing ash ponds). Promotes resource efficiency and reduces the need for raw materials in construction, while proper disposal is crucial to prevent soil and water contamination, including heavy metals.
• Nitrogen pollution: reactive $N$ overuse; UNEP Colombo goal – halve $N$ waste by $2030$ (UN Environment Programme's goal for managing nitrogen pollution). Leads to eutrophication in water bodies, greenhouse gas emissions (specifically N$_2$O, a potent GHG), and air pollution (through NOx formation).
• WHO AQG 2021: PM$2.5$ annual cut $10\to5$ µg m$^{-3}$ (World Health Organization Air Quality Guidelines revised to stricter levels); India far above current levels. Highlights the urgent need for India to accelerate its air quality improvement efforts, as current levels are several times higher than the revised guidelines, posing severe health risks.

Coal TPPs & Transition

• Coal ≈$55\%$ of India power; 2015 emission norms delayed to $2027$+ (indicating a slow pace in environmental compliance for the power sector).
• ESI 2024-25: no economic case for premature closures; recommends phased retrofit, new ultra-supercritical tech, RE scale-up, CCS pilots (Carbon Capture and Storage). Stresses the importance of a just transition for workers and communities dependent on the coal sector, alongside investment in grid stabilization and storage solutions for renewables to ensure energy security during the shift.

Water Stress & Policy

• Per-capita availability slid $5100\to1400$ m$^3$ since $1950$ (a dramatic decrease due to population growth and increased demand); agriculture uses $80\%$ (mostly GW) (groundwater, leading to significant depletion).
• Drivers: pop’n (population growth), rainfall variability (impacts of climate change on monsoon patterns), subsidies (MSP, free power) (Minimum Support Price for crops and free electricity for irrigation encouraging water-intensive agriculture), storage
<$10\%$ of precipitation (low water storage capacity). Rapid urbanization, industrial growth, and inefficient irrigation practices further exacerbate water scarcity.
• Schemes: Jal Shakti Abhiyan (conservation and water resource management), Atal Bhujal (community-led sustainable groundwater management), PMKSY (Pradhan Mantri Krishi Sinchayee Yojana for irrigation efficiency), CWMI index (Composite Water Management Index). Need pricing reform (for water and energy), micro-irrigation (drip/sprinkler), rain-harvest, wastewater reuse.

Ground-Water

• India extracts $253$ BCM/yr (¼ global) (making India the largest groundwater user); 61 % wells declining (indicating widespread over-extraction).
• Depletion plus nitrate/fluoride contamination (from agricultural runoff and natural sources); CGWA NOCs 2020 (Central Ground Water Authority No Objection Certificates for groundwater extraction), NAQUIM mapping (National Aquifer Mapping and Management Program).
• Solutions: energy-price rationalisation (to disincentivize excessive pumping), crop switch (to less water-intensive crops), MAR (Managed Aquifer Recharge), strict GW fee (for regulating extraction), community stewardship (local management of groundwater resources).

River Health

• 311 polluted stretches (2022) (as identified by the Central Pollution Control Board); STP capacity 26,869 MLD vs sewage 72,000 MLD (significant gap between sewage generation and treatment capacity).
• Namami Gange II (₹$22{,}500$ cr till $2026$): STPs, river-fronts, afforestation; delays & utilisation issues persist; push for flow restoration & decentralised sewage. Challenges include land acquisition issues for STPs, maintenance of constructed infrastructure, and lack of effective enforcement against industrial and municipal discharge contributing to pollution.

Coastal & Marine

• High Seas Treaty 2023: MPAs, EIA, benefit-sharing; India signed (not yet ratified). This global treaty aims to protect biodiversity in areas beyond national jurisdiction, establishing Marine Protected Areas (MPAs) and regulating activities.
• UN-OC3 2025 “Nice Plan”: funding gap for SDG-14; 56/60 ratifications (Sustainable Development Goal 14: Life Below Water).
• Marine plastics: India 9.3 Mt/yr (million tons per year, a huge contributor to global plastic pollution); PWM Rules 2016 (Plastic Waste Management Rules), SUP ban 2022 (Single-Use Plastic ban); EPR portal 2022 (Extended Producer Responsibility for plastic waste); need circular economy & formal recycling. The informal waste collection sector plays a significant role but often lacks proper infrastructure and safety measures for comprehensive plastic waste management, leading to environmental leakage.
• Dead Zones: ocean de-oxygenation quadrupled; curb nutrient runoff & CO$2$ (primary drivers of dead zones, caused by agricultural runoff and climate change).

Conservation Highlights

• Ramsar sites India = $91$; 2025 additions – Khichan & Menar wetlands (Rajasthan). Designation as Ramsar sites provides international recognition and supports conservation efforts crucial for biodiversity and ecosystem services like water purification and flood control.
• MISHTI: plant $540$ km$^2$ mangroves $2023$-28; India joins Mangrove Alliance for Climate. Mangroves are vital coastal ecosystems providing protection against storms, nurseries for marine life, and significant carbon sequestration, acting as natural climate solutions.
• Coral bleaching 4th global event (2023-25); need CO$2$ cuts, MPAs. Primarily driven by rising ocean temperatures due to climate change, leading to corals expelling symbiotic algae and eventually dying if stress persists, impacting marine biodiversity and coastal protection.
• Seagrass $517$ km$^2$ in India; carbon sink & fish nursery – protect from trawling/pollution. Seagrass beds are critical marine habitats for various species and play a significant role in carbon storage.

Waste Management Snapshots

• Solid waste 62 Mt/yr; SBM 2.0
→ “Garbage-Free Cities”; SWM Rules 2016: 3-way segregation, user-fee, EPR. Despite rules, on-ground segregation remains a major challenge, leading to mixed waste streams that hinder effective recycling and processing, often ending up in landfills.
• C&D waste rules 2016: segregation, recycling; only 1% recycled—need market pull. Lack of robust material recovery facilities, low awareness among generators, and insufficient demand for recycled C&D products are key barriers.
• Biomedical waste 774 t/day; BMW Rules 2016/18; CBMWTF shortage (Common Biomedical Waste Treatment Facilities). Inadequate capacity and improper handling pose significant public health risks due to infectious materials and hazardous chemicals, especially during disease outbreaks.
• E-waste Rules 2022: EPR targets $60\text{-}80\%$; informal sector integration vital. Informal recyclers, though efficient in material recovery due to low costs, often employ unsafe practices like acid baths for metal extraction, causing severe pollution and health hazards to workers and the environment. Formalizing this sector is crucial for responsible e-waste management.
• Noise Rules 2000: limits & silent zones; enforcement weak; smart monitoring + public awareness required. Noise pollution impacts human health (stress, hearing loss) and wildlife, but often receives less regulatory attention.

Environmental Governance Tools

• EIA 2006: Category A Centre, B1+B2 State; challenges – poor data, weak public hearing, compliance gaps. Concerns exist regarding biased consultants preparing reports, lack of stringent post-clearance monitoring, and the independence of expert appraisal committees, leading to environmental degradation.
• 2022 amendments: defence roads
<$100$ km of LoC, biomass TPP \leq$15$ MW exempted. These exemptions raise environmental concerns about unchecked development in ecologically sensitive border areas and potential cumulative impacts from smaller power plants.
• Need independent