In a recent analysis by the Centre for Research on Energy and Clean Air (CREA), it was found that 204 out of 238 Indian cities failed to meet air quality standards during the winter of 2025-26. This highlights the critical issue of air pollution in India, relevant for UPSC aspirants studying GS Papers 1, 2, and 3. Last Updated: 07-03-2026

Key Facts About Air Pollution in Indian Cities

204 out of 238 cities did not meet the Indian National Ambient Air Quality Standard (NAAQS) for PM2.5.
The Indian NAAQS for PM2.5 is 40 µg/m³, while the WHO standard is 5 µg/m³.
Ghaziabad recorded the highest PM2.5 concentration at 172 µg/m³.
Chamarajanagar in Karnataka was the cleanest city with 19 µg/m³ PM2.5 concentration.
Data was collected by the Central Pollution Control Board (CPCB) through Continuous Ambient Air Quality Monitoring Stations (CAAQMS).
The analysis underscores the need for stringent air quality management and policy interventions.

India's Struggle with Air Quality

The macro-level significance of air pollution in India is profound, affecting public health, economic productivity, and international reputation. India's economic hubs, including Delhi, Mumbai, and Kolkata, face severe air quality challenges, impacting millions. Comparatively, India's air quality ranks among the worst globally, necessitating urgent action to align with international standards and improve public health outcomes.

UPSC Relevance

For UPSC aspirants, this topic is relevant to GS Paper 1 (Geography), GS Paper 2 (Governance, Policies), and GS Paper 3 (Environment). In the prelims, questions may focus on air quality standards and key pollutants. For mains, discussions could center on policy effectiveness, urban planning, and environmental sustainability. This topic also intersects with essay themes on sustainable development and public health.

FAQ Section

What is PM2.5 and why is it dangerous?

PM2.5 refers to particulate matter with a diameter of 2.5 micrometers or less, which can penetrate deep into the lungs and bloodstream, causing respiratory and cardiovascular diseases.

Why is air pollution important in India?

Air pollution is a critical issue in India due to its severe impact on public health, economic productivity, and compliance with international environmental standards.

What are the key features of the National Clean Air Programme?

The National Clean Air Programme (NCAP) aims to reduce particulate matter pollution by up to 40% by 2026 through city-specific action plans, monitoring expansion, and coordinated pollution control measures.

204 out of 238 Indian cities failed to meet national air quality standards.
No city achieved WHO safe PM2.5 levels of 5 µg/m³.
Ghaziabad was the most polluted city with 172 µg/m³ PM2.5 concentration.
Noida and Delhi followed with 166 µg/m³ and 163 µg/m³ respectively.
Other polluted cities include Kolkata (78 µg/m³), Mumbai (48 µg/m³), and Chennai (44 µg/m³).
Chamarajanagar was the cleanest city at 19 µg/m³.
Bengaluru slightly met NAAQS with 39 µg/m³ PM2.5.
Southern and Central/Northeastern India performed best in air quality.
Core pollutants include PM10, PM2.5, and ground-level ozone.
Photochemical smog is common in heavily motorized cities.
Temperature inversion traps pollutants near the ground.
Acid rain is formed by nitrogen oxides and sulfur dioxide.
The AQI is used to communicate air quality levels.
NAAQS regulates ambient air quality in India.
GRAP implements anti-pollution measures based on AQI levels.
NCAP aims for a 40% reduction in particulate matter by 2026.

Severe Air Pollution in Indian Cities: CREA Analysis Results

Key Points