Invisible epidemic: why air pollution is India’s largest health threat?, PgII

Key Highlights:

• Air pollution in India has become a nationwide public health emergency, affecting all demographics and organ systems.
• In 2025, 150 out of 256 Indian cities exceeded the national PM 2.5 standard.
• Delhi recorded seasonal PM 2.5 levels of 107–130 g/m³, far exceeding both Indian and WHO limits in 2025.
• Air pollution contributed to nearly two million deaths in India in 2023, with a 43% increase in pollution-linked mortality since 2000.
• The Air Quality Life Index (AQLI) indicates that air pollution reduces life expectancy significantly for 46% of Indians.

Detailed Insights:

• India's Air Quality Index (AQI) has an outdated upper cap of 500, which doesn't reflect real-time pollution levels that often exceed this value.
• PM 2.5 particles cause cardiovascular harm by penetrating the lungs, entering the bloodstream, and causing systemic inflammation.
• Exposure to PM 2.5 is linked to respiratory illnesses, with a modest increase leading to spikes in pediatric emergency visits for respiratory distress.
• Air pollution affects the brain, potentially leading to poorer academic performance, impaired memory, and a higher risk of dementia.
• High PM 2.5 exposure during pregnancy is associated with preterm births, low birth weight, and increased neonatal mortality.
• Lower-income communities are disproportionately affected by air pollution due to their proximity to emission hotspots and limited access to resources.
• Key contributors to PM 2.5 levels include vehicular emissions, industrial processes, construction dust, waste burning, and household biomass use.
• Recommended strategies include transport electrification, strict industrial pollution control, construction regulation, waste-management reform, and health-system integration.

Key Concepts Involved:

• PM 2.5: Fine inhalable particles with a diameter of 2.5 micrometers or less that can penetrate deep into the lungs and bloodstream.
• Air Quality Index (AQI): An index for reporting daily air quality, indicating how clean or polluted the air is, and associated health effects.
• National Clean Air Programme (NCAP): A Government program to reduce air pollution in Indian cities.