To combat pollution, we need to cast a wider net, go beyond the city, Pg10

Key Highlights:

• A Delhi minister acknowledged the scientific distinction between PM10 and PM2.5 pollution sources, a long-sought understanding from policymakers.
• The transport sector is a major contributor to Delhi's PM2.5 emissions, accounting for around 40%, as per SAFAR findings under MoES.
• An exceptionally strong Super El Niño event is predicted to significantly worsen Delhi's winter air quality by trapping pollutants.
• The festive season, with firecracker use, and peak stubble burning are expected to coincide in early November, creating a critical pollution window.
• There is a strong call for a decisive shift from a city-centric to an airshed-based approach for air quality management, as outlined in NARFI.

Detailed Insights:

• The National Clean Air Programme (NCAP) metric, which gauges performance by percentage reduction in PM10, previously skewed pollution control priorities towards dust.
• Delhi's Winter Action Plan includes measures such as narrow road-sweeping machines, doubling parking charges, and work-from-home provisions under GRAP.
• Super El Niño is expected to drastically reduce wind speed, lead to an absence of Westerly Disturbances, and lower the surface inversion layer, all contributing to pollutant accumulation.
• Recent research and farmer interactions suggest stubble burning has shifted to evenings, potentially being missed by MODIS-based fire detection.
• The period of November 5-10 has historically been Delhi's most challenging pollution period, likely to intensify this year due to El Niño-driven weaker winds.
• Climate change is amplifying natural drivers of pollution, making India's air quality challenge, particularly across the Indo-Gangetic Region, increasingly complex.
• The National Air Quality Resource Framework of India (NARFI), developed by NIAS under the auspices of the Office of the Principal Scientific Adviser, proposes an airshed-based management strategy.

Key Concepts Involved:

• PM2.5: Fine particulate matter, 2.5 micrometers or less in diameter, considered most harmful to human health.
• PM10: Particulate matter, 10 micrometers or less in diameter, includes dust, pollen, and mold spores.
• Super El Niño: An exceptionally strong warming of the Pacific Ocean, significantly impacting global weather patterns.
• Airshed: A geographical area where air pollution tends to be contained due to specific meteorological and topographical conditions.
• Westerly Disturbances: Extratropical storms originating in the Mediterranean region, bringing sudden winter rain to North India.