What is Air Pollution (PM2.5, PM10)?
Historical Background
Key Points
8 points- 1.
Particulate Matter (PM): Microscopic solid or liquid particles suspended in the air. PM2.5 has a diameter of 2.5 micrometers or less, capable of penetrating deep into the lungs and bloodstream, causing severe health issues.
- 2.
PM10: Particulate matter with a diameter of 10 micrometers or less, which can enter the lungs and cause respiratory problems.
- 3.
Major Sources: Vehicular emissions (from fossil fuel combustion), industrial emissions, construction dust, biomass burning (e.g., stubble burning in agricultural areas), power plants, and household burning of solid fuels.
- 4.
Health Impacts: Leads to respiratory diseases (asthma, bronchitis), cardiovascular diseases (heart attacks, strokes), lung cancer, premature deaths, and impaired cognitive development in children.
- 5.
Environmental Impacts: Contributes to smog, acid rain, reduced visibility, damage to vegetation and ecosystems, and plays a role in climate change.
- 6.
Monitoring & Standards: Monitored by the Central Pollution Control Board (CPCB) and State Pollution Control Boards (SPCBs) through the National Air Quality Monitoring Programme (NAMP). National Ambient Air Quality Standards (NAAQS) set permissible limits for various pollutants.
- 7.
Air Quality Index (AQI): A tool to communicate air quality status to the public in an easily understandable manner, ranging from 'Good' to 'Severe'.
- 8.
Control Measures: Implementation of stricter emission norms (e.g., Bharat Stage (BS) VI), promotion of public transport, use of cleaner fuels, industrial emission controls, and waste management strategies.
Visual Insights
Air Pollution: Causes, Impacts & Control Measures
This mind map provides a comprehensive overview of air pollution, detailing its sources, health and environmental impacts, and the various measures adopted for its control and monitoring.
Air Pollution
- ●Major Pollutants
- ●Key Sources
- ●Impacts
- ●Control Measures & Governance
India's Air Quality Snapshot (December 2025 Estimates)
This dashboard provides key statistics related to air pollution in India, highlighting the scale of the challenge and progress on control measures.
- Annual Average PM2.5 (Delhi-NCR)
- 80-90 µg/m³-5% (YoY)
- NCAP Target Achievement (PM Concentration Reduction)
- 15-20% (Avg. in target cities)Progressing
- Number of Non-Attainment Cities (NCAP)
- 131Stable
- Bharat Stage (BS) VI Emission Norms Implementation
- 100%N/A
Still significantly higher than NAAQS (40 µg/m³) and WHO guidelines (5 µg/m³), indicating persistent severe pollution.
The National Clean Air Programme (NCAP) aimed for 20-30% reduction by 2024. While some cities have shown significant improvement, others lag, leading to partial overall achievement.
Cities that consistently exceed National Ambient Air Quality Standards. These cities are the focus of NCAP interventions.
Implemented nationwide for all new vehicles since April 2020, significantly reducing vehicular emissions of PM, NOx, and SOx.
Particulate Matter: PM2.5 vs PM10
This table provides a clear comparison between PM2.5 and PM10, two critical air pollutants, highlighting their differences in size, health impacts, and sources.
| Feature | PM2.5 (Fine Particulate Matter) | PM10 (Coarse Particulate Matter) |
|---|---|---|
| Definition | Particles with a diameter of 2.5 micrometers or less. | Particles with a diameter of 10 micrometers or less. |
| Size Comparison | Roughly 1/30th the average width of a human hair. | Roughly 1/7th the average width of a human hair. |
| Penetration | Can penetrate deep into the lungs and even enter the bloodstream. | Can enter the lungs but generally filtered out in the upper respiratory tract. |
| Health Impacts | Severe: Respiratory diseases (asthma, bronchitis), cardiovascular diseases (heart attacks, strokes), lung cancer, premature deaths, impaired cognitive development. | Less severe than PM2.5 but still causes respiratory problems, irritation of eyes, nose, and throat. |
| Major Sources | Combustion processes (vehicular emissions, industrial emissions, power plants, biomass burning), secondary aerosols. | Dust from roads, construction sites, agricultural fields, industrial processes, pollen, mold spores. |
Recent Developments
5 developmentsImplementation of Bharat Stage (BS) VI emission norms across India since April 2020 for all new vehicles, significantly reducing vehicular pollution.
Launch of the National Clean Air Programme (NCAP) in 2019, aiming to reduce PM concentrations by 20-30% by 2024 (from 2017 levels) in 131 non-attainment cities.
Increased public awareness and policy focus on the Air Quality Index (AQI) for real-time air quality information.
Implementation of emergency measures like the Graded Response Action Plan (GRAP) in Delhi-NCR during severe pollution episodes, including restrictions on construction and vehicular movement.
Growing emphasis on electric vehicles and renewable energy sources to reduce fossil fuel dependence and associated emissions.