Conceptual Framework:
- Definition: Contamination of the atmosphere by harmful gases and particulates, adversely affecting human health, ecosystems, and climate.
- Pollutant Types: Comprises gaseous emissions (NOx, SOx) and particulate matter (PM10, PM2.5).
- Primary Drivers: Rapid industrialization, vehicular emissions, fossil fuel combustion, and natural phenomena (dust storms).
Severity of the Crisis
- Global Standing: India ranks among the nations with the highest particulate matter burden globally.
- Population Exposure: As of 2021, approximately 97% of the population is exposed to PM2.5 levels exceeding WHO guidelines.
- Geographical Spread: The crisis, once limited to metros like Delhi, has permeated Tier-2 and Tier-3 cities.
Impact Assessment
Public Health:
- Prevalence of respiratory disorders (Asthma, COPD) and cardiovascular diseases.
- Mortality: The Health Effects Institute (2018) projects annual pollution-related deaths to rise from 1.1 million (2015) to 1.7 million by 2030.
Economic Cost:
- Estimated annual loss of over $150 billion.
- Drivers: Reduced labor productivity, increased healthcare expenditure, and declining agricultural yields.
Environmental Degradation:
- Acid rain affecting crops and aquatic life.
- Acceleration of global warming via Greenhouse Gas (GHG) emissions.
Monitoring Mechanism: Air Quality Index (AQI)
- Objective: To simplify air quality data using a “One Number-One Colour-One Description” framework.
- Target Pollutants: Tracks eight specific pollutants—PM10, PM2.5, NO2, SO2, CO, O3, NH3, and Pb.
- Categorization: Classifies air quality into six tiers (Good to Severe) to indicate health risks.
Legal and Institutional Architecture
Statutory Basis:
- Air (Prevention and Control of Pollution) Act, 1981: The primary legal framework for regulation.
- CAQM Act, 2021: Established the Commission for Air Quality Management for the NCR and adjoining areas to ensure interstate coordination.
- Regulatory Bodies: Central Pollution Control Board (CPCB) and State Pollution Control Boards (SPCBs).
- Standards: National Ambient Air Quality Standards (NAAQS) prescribe limits for 12 key pollutants.
Strategic Interventions
National Clean Air Programme (NCAP):
- A national-level strategy launched in 2019.
- Target: Revised aim to reduce PM concentrations by 40% by 2026 (Base year: 2017).
Graded Response Action Plan (GRAP):
- An emergency response mechanism specifically for Delhi-NCR.
- Modality: Enforces incremental restrictions (e.g., construction bans, traffic rationing) based on AQI severity.
Technological Shifts:
- Nationwide implementation of BS-VI emission norms (2020).
- Promotion of cleaner fuels (CNG, LPG) and installation of Smog Towers.
Way Forward :
- Energy Transition: Aggressive promotion of renewables (Solar, Wind) to decarbonize the energy grid.
- Green Mobility: Incentivizing public transport and carpooling to curb vehicular density.
- Urban Forestry: Development of green corridors and urban belts to act as carbon sinks and pollutant absorbers.
