Source: TH
Subject: Pollution and other issues
Context: A new assessment shows that air pollution is now India’s largest health threat, cutting life expectancy, worsening disease burdens, and affecting vulnerable groups nationwide.
About Invisible Epidemic: Air Pollution in India
Trends in India’s Air Pollution:
- Air pollution is no longer a seasonal winter issue, but a perennial national health crisis affecting rural and urban regions alike.
- Of 256 cities monitored in 2025, 150 exceeded PM2.5 limits, indicating widespread non-compliance.
- Delhi’s seasonal PM2.5 levels reached 107–130 µg/m³, far above India’s limit (60 µg/m³) and WHO guideline (15 µg/m³).
- India’s AQI system still caps readings at 500, masking extreme pollution that often crosses 600–1,000.
- Long-term exposure now reduces life expectancy by 3.5–8 years across northern India.
Causes of Air Pollution in India:
Structural issues:
- Vehicular emissions: Rapid motorisation, old diesel fleets, traffic congestion, and poor public transport lead to continuous NOx, PM2.5 and ozone formation, especially in metros.
- Industrial pollution: Coal-based power plants, refineries, brick kilns, and chemical units release sulphur dioxide, nitrogen oxides, heavy metals and particulate matter throughout the year.
- Construction and demolition dust: Unregulated digging, material loading, concrete mixing, and demolition generate large amounts of PM10/PM2.5, worsening air quality in expanding urban corridors.
- Household biomass use: Firewood, dung cakes and crop residues burned in rural and peri-urban kitchens produce indoor and outdoor smoke, contributing heavily to PM2.5 levels.
Seasonal Amplifiers:
- Stubble burning: post-harvest crop burning in Punjab-Haryana adds massive but short-term particulate spikes, worsening air quality in Delhi and the Indo-Gangetic Plains.
- Winter inversion layers: Cold, stagnant air traps pollutants near the surface, preventing dispersion and causing PM2.5 to accumulate for days or weeks in northern India.
- Fireworks and festival combustion: Diwali and New Year fireworks, combined with low wind speeds, create sudden surges in toxic gases and particulates, amplifying existing pollution loads.
Impacts of Air Pollution on the Human Body:
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- PM2.5 enters bloodstream, causing inflammation, hypertension, heart attacks, strokes.
- Every 10 µg/m³ increase leads to 8% rise in annual mortality.
- Respiratory System:
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- Rising cases of asthma (6% of Indian children), COPD, chronic bronchitis.
- PM2.5 increases paediatric emergency visits by 20–40%; lung capacity drops 10–15% in exposed children.
- Neurological System:
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- PM2.5 crosses the blood–brain barrier → neuroinflammation, cognitive decline, dementia risk (+35–49%).
- Linked to reduced academic performance in polluted Indian cities.
- Maternal & Child Health:
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- Higher risks of preterm birth, low birth weight, stillbirths, and neonatal mortality.
- Worsens intergenerational health inequities.
- Social & Economic Inequalities: The poor live closest to roads, industrial belts, landfills, suffering disproportionate exposure and healthcare burdens.
Initiatives Taken by India:
- National Clean Air Programme (NCAP):
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- Targets 40% reduction in PM10 in 131 non-attainment cities.
- Expanded monitoring networks, city action plans, and clean mobility pilots.
- Policy & Regulatory Measures:
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- GRAP in Delhi-NCR, BS-VI fuel norms, EV push, smog towers, anti-smog guns.
- Industrial emission norms, construction dust rules, waste management guidelines.
- Judicial Interventions: Supreme Court and NGT directives on stubble burning, fireworks, and industrial emissions.
- Technological Steps: Real-time monitoring, satellite-based assessments, low-emission zones (pilot), and EV incentives.
Way Ahead:
- Modernise Air Quality Governance: Reform the AQI system by removing the 500 cap, aligning thresholds with WHO norms, and making PM2.5 the central regulatory metric for all clean-air planning.
- Strengthen Environmental Institutions: Increase staffing, funding, and technical capacity of pollution control boards, ensure independent oversight, and enforce real-time, science-based compliance monitoring.
- Transform Transport and Industry: Accelerate electrification of buses, autos and two-wheelers; shift freight to rail; and mandate strict industrial emission standards while phasing down coal-heavy processes.
- Regulate Construction and Waste Burning: Implement compulsory dust suppression, enclosure norms and mechanised sweeping, while reforming municipal waste systems to end open burning in all urban clusters.
- Integrate Health & Community Action: Embed AQI advisories in healthcare, expand lung-function testing and COPD screening, and promote citizen-led air monitoring and localised clean-air interventions.
Conclusion:
India’s air pollution is an invisible epidemic—silent, chronic, and the largest threat to public health. The evidence is unequivocal: it shortens lives, harms the unborn, weakens the brain, and deepens inequity. Clean air must now be recognised as a fundamental right and national priority, anchored in science, backed by political will, and implemented with urgency to secure a healthier, equitable future.
