What Happened
- Ghaziabad ranked as India's most polluted city during winter 2025-26 (October 1, 2025 – February 28, 2026), recording an average PM2.5 concentration of 172 μg/m³.
- Noida ranked second (166 μg/m³) and Delhi ranked third (163 μg/m³) — all three are in the NCR (National Capital Region).
- Data is derived from Continuous Ambient Air Quality Monitoring Stations (CAAQMS) of the Central Pollution Control Board (CPCB), covering 238 cities.
- At least 204 out of 238 cities with sufficient monitoring data exceeded India's National Ambient Air Quality Standards (NAAQS) for PM2.5 — up from 173 cities in the previous winter.
- Chamarajanagar (Karnataka) was the cleanest city in India during winter 2025-26 (PM2.5: 19 μg/m³).
- The findings indicate the National Clean Air Programme's (NCAP) 2026 target of 40% PM reduction from 2017 levels is unlikely to be achieved nationwide.
Static Topic Bridges
Air Quality Measurement Standards and CPCB Framework
India's air quality monitoring and regulation is governed by the Environment (Protection) Act, 1986, with the Central Pollution Control Board (CPCB) as the apex technical body. The National Ambient Air Quality Standards (NAAQS), last revised in 2009, set permissible concentration limits for 12 pollutants. For PM2.5 (particulate matter with aerodynamic diameter ≤2.5 microns), India's NAAQS sets the annual mean standard at 40 μg/m³ and the 24-hour mean at 60 μg/m³ — both significantly higher (more permissive) than the WHO guideline of 5 μg/m³ (annual mean) updated in 2021. The Air Quality Index (AQI) system, introduced by CPCB, classifies air quality into six categories: Good (0-50), Satisfactory (51-100), Moderate (101-200), Poor (201-300), Very Poor (301-400), and Severe (401-500). CAAQMS stations provide real-time, continuous data.
- India NAAQS PM2.5 annual standard: 40 μg/m³ (8x above WHO guideline of 5 μg/m³)
- Ghaziabad winter 2025-26 average PM2.5: 172 μg/m³ — over 4x India's own standard
- WHO 2021 guideline (PM2.5 annual): 5 μg/m³ (revised from 10 μg/m³ in 2005 guidelines)
- CPCB established under Water (Prevention and Control of Pollution) Act, 1974; given air quality mandate under Air (Prevention and Control of Pollution) Act, 1981
Connection to this news: The CPCB CAAQMS data underpins the winter pollution rankings. The fact that 204/238 cities exceed India's own (already permissive) NAAQS standard underscores the scale of the crisis — by WHO standards, essentially the entire monitored urban India fails.
National Clean Air Programme (NCAP) and Non-Attainment Cities
The National Clean Air Programme (NCAP) was launched by the Ministry of Environment, Forest and Climate Change (MoEFCC) in January 2019 — India's first national-level strategy specifically targeting air pollution reduction. NCAP initially targeted 20-30% reduction in PM10 and PM2.5 by 2024 (from 2017 baseline); this was revised in September 2022 to a more ambitious 40% reduction by 2026. The programme covers 131 "non-attainment cities" — cities that failed to meet NAAQS for five or more consecutive years. City-specific action plans (Clean Air Action Plans) are prepared and funded through the 15th Finance Commission grants. An online dashboard (Prana Portal) tracks progress.
- NCAP launched: January 2019; revised 2026 target: 40% PM reduction from 2017 baseline
- Non-attainment cities covered: 131 cities across 24 states/UTs
- PM2.5 data availability: 49 cities had data for all five years (2019-2023)
- Early achievers of 40% target: Jodhpur (50%), Kanpur (50%), Meerut (42%), Lucknow (41%)
- 28 cities (of 130 covered) still lack CAAQMS (continuous monitoring infrastructure)
- Funding mechanism: 15th Finance Commission air quality grants to urban local bodies
Connection to this news: The winter 2025-26 data — 204 cities exceeding NAAQS versus 173 the previous year — demonstrates worsening aggregate performance even as select cities improve, confirming independent analyses that NCAP's 2026 national target will not be met. This creates a governance accountability question for urban local bodies and state governments.
Winter Pollution in the Indo-Gangetic Plain: Sources and Meteorology
Winter air pollution in the Indo-Gangetic Plain (IGP) — which includes Ghaziabad, Delhi, Noida, and most of UP, Haryana, Punjab — results from the convergence of multiple emission sources with adverse meteorological conditions. Key emission sources: vehicular emissions, industrial effluents, construction dust, crop residue burning (Punjab/Haryana stubble burning — October-November), coal combustion (domestic heating, thermal power plants), and brick kilns. In winter, the planetary boundary layer (PBL) contracts (from ~2 km in summer to ~200-400 m), trapping pollutants near the surface. Temperature inversions prevent vertical mixing. Low wind speeds reduce dispersion. The Graded Response Action Plan (GRAP), implemented in Delhi-NCR by the Commission for Air Quality Management in NCR and Adjoining Areas (CAQM), prescribes tiered restrictions based on AQI severity.
- CAQM: statutory body established in 2021 under the Commission for Air Quality Management in National Capital Region and Adjoining Areas Act, 2021; replaced Environment Pollution (Prevention and Control) Authority (EPCA)
- GRAP stages: Stage I (Poor AQI > 201), Stage II (Very Poor > 301), Stage III (Severe > 401), Stage IV (Severe+ > 450) — escalating construction/vehicle/industrial bans
- Stubble burning (Punjab/Haryana): contributes 20-40% of Delhi's PM2.5 during peak burning season (October-November)
- Smog Tower programme: Delhi's Connaught Place and Anand Vihar towers (pilot) — limited effectiveness documented
Connection to this news: Ghaziabad surpassing Delhi reflects Ghaziabad's positioning deeper in the IGP pollution sink, combined with less stringent enforcement relative to Delhi's GRAP regime — highlighting the critical gap in CAQM's jurisdiction extending effectively to Tier-2 NCR cities.
Key Facts & Data
- Most polluted city, winter 2025-26: Ghaziabad (PM2.5: 172 μg/m³)
- Second most polluted: Noida (PM2.5: 166 μg/m³)
- Third: Delhi (PM2.5: 163 μg/m³)
- Data period: October 1, 2025 – February 28, 2026
- Source: CPCB CAAQMS data
- Cities exceeding NAAQS PM2.5: 204 out of 238 monitored cities (vs. 173 the previous year)
- Cleanest city: Chamarajanagar, Karnataka (PM2.5: 19 μg/m³)
- India NAAQS PM2.5 annual standard: 40 μg/m³
- WHO PM2.5 guideline (2021): 5 μg/m³ annual mean
- NCAP target: 40% PM reduction from 2017 baseline by 2026
- NCAP non-attainment cities: 131 across 24 states/UTs
- CAQM established: 2021 (statutory body); replaced EPCA