Air pollution remains one of India’s most pressing environmental and public health challenges. Despite institutional advancements such as the National Clean Air Programme (NCAP), the Graded Response Action Plan (GRAP), and expansion of the Air Quality Index (AQI) monitoring network, major Indian cities continue to record PM₂.₅ and PM₁₀ concentrations exceeding National Ambient Air Quality Standards (NAAQS). This article evaluates India’s policy response through NCAP implementation, institutional mechanisms, and AQI trends in major cities, assessing both structural progress and persisting gaps. It argues that while regulatory architecture has strengthened significantly, sustained emission reduction requires deeper sectoral reforms, urban governance capacity, and airshed-based coordination.
Background: The Scale of the Crisis
India consistently features among countries with the highest urban particulate pollution levels globally. PM₂.₅ and PM₁₀ concentrations in cities such as Delhi, Kanpur, Lucknow, Mumbai, and Kolkata frequently exceed safe thresholds, especially during winter. The Air Quality Index (AQI), launched in 2015, provides real-time public information on pollution levels. The Central Pollution Control Board (CPCB) currently operates 1,447 monitoring stations (516 continuous + 931 manual) across 516 cities marking a significant expansion of India’s air monitoring infrastructure.
However, 123 cities have been identified as Non-Attainment Cities (NACs) for consistently exceeding NAAQS standards.
Policy Architecture: The National Clean Air Programme (NCAP)
Launched in January 2019, NCAP is India’s first comprehensive national-level strategy to tackle air pollution.
Core Features
- Coverage: 131 cities (Non-Attainment + Million Plus cities)
- Original Target: 20–30% reduction in PM₁₀ by 2024 (baseline: 2017)
- Revised Target: Up to 40% reduction or achieving NAAQS by 2025–26
- City-specific Clean Air Action Plans (CAPs)
- Performance-linked financial support, convergence funding through schemes like SBM, AMRUT, Smart Cities, FAME2,
- Importantly, 88 out of 131 cities showed improvement in annual PM₁₀ levels in FY 2022–23 compared to the baseline year
AQI Trends in Major Cities
- Delhi-NCR – Seasonal spikes driven by meteorology, stubble burning, vehicular density, and construction dust. GRAP invoked during severe episodes.
- Mumbai – Improvement in industrial compliance but growing construction dust and transport emissions.
- Kolkata – Coal-based industrial activity and regional meteorological stagnation contribute to sustained moderate-to-poor AQI levels.
Tier-II Cities
Cities like Lucknow, Kanpur, Patna, and Varanasi show chronic PM exceedance, indicating that pollution is no longer a metro-only phenomenon. Trend analysis indicates.
- Gradual PM₁₀ decline in several NCAP cities.
- Persistent winter peaks in northern India.
- Mixed results in PM₂.₅ reduction, indicating secondary aerosol formation and regional transport
Key Gaps
Despite significant institutional strengthening under the National Clean Air Programme (NCAP), structural and implementation gaps continue to limit sustained air quality improvement.
- Fragmented Governance– Air pollution is transboundary, yet policy execution remains city-specific and administratively siloed. While the Commission for Air Quality Management (CAQM) coordinates in NCR, similar statutory airshed-level mechanisms are absent in other high-pollution regions.
- Limited PM₂.₅-Focused Strategy– Although PM₂.₅ poses the greatest health risk, early NCAP targets emphasized PM₁₀ reduction. Secondary particulate formation (linked to NOx, SO₂, and ammonia emissions) remains insufficiently addressed, particularly in thermal power and agricultural sectors.
- Weak Urban Local Body (ULB) Capacity– Many municipalities lack technical expertise for emissions inventory preparation, source apportionment studies, and data-driven planning. City Action Plans often remain compliance documents rather than adaptive policy tools.
- Enforcement Deficit– While Continuous Emission Monitoring Systems (CEMS) and stricter standards exist, enforcement remains uneven across states. Delays in penalty imposition, monitoring gaps in smaller towns, and limited third-party audits weaken regulatory credibility.
- Financial and Implementation Constraints– NCAP funding relies heavily on convergence with other urban schemes. Smaller cities face difficulty sustaining pollution-control infrastructure (e.g., EV charging, mechanical sweepers, monitoring stations).
- Seasonal Vulnerability– Winter inversion conditions in northern India cause severe pollution episodes. Mechanisms such as GRAP are reactive and emergency-triggered rather than structurally preventive.
- Health Integration Gap– Despite strong evidence linking air pollution to morbidity and mortality, pollution-health cost assessments are not systematically integrated into urban planning or economic decision-making.
Way Forward
To transition from episodic pollution control to sustained air quality improvement, India must adopt a structurally transformative approach.
- Institutionalize Airshed-Based Governance – Establish regional statutory authorities beyond NCR to enable coordinated policy across states. Pollution modelling and cross-border emission management must become standard practice.
- Shift to PM₂.₅-Centric and Secondary Pollutant Strategy– Accelerate installation of Flue Gas Desulfurization (FGD) systems in thermal plants, address ammonia emissions from agriculture, and strengthen controls on precursor gases that contribute to secondary particulate formation.
- Urban Transport Transformation– Rapid electrification of public transport, expansion of metro and regional rail systems, promotion of non-motorized transport, and congestion pricing in dense urban centres are essential for long-term emission reduction.
- Industrial and Energy Transition– Mandate cleaner fuel adoption for red-category industries, promote green financing mechanisms, and expand emissions trading schemes to incentivize compliance.
- Integrate Health and Economic Metrics– Develop a national air quality–health surveillance system and quantify economic losses from pollution to strengthen policy prioritization.
- Enhance Data Transparency and Predictive Governance– Integrate CPCB, satellite, and city-level data into unified public dashboards and deploy AI-based forecasting tools for proactive intervention.
Strategic Outlook
India’s air governance framework has matured significantly; however, achieving NCAP’s revised 40% reduction target requires a shift from reactive management to systemic emission transformation across transport, energy, agriculture, and urban design. The next phase must prioritize prevention, regional coordination, and institutional capacity-building to secure long-term public health and environmental sustainability.
