Summary
Writing on Delhi's coming winter, the founder of SAFAR argues that the city's pollution strategy is drawn on the wrong map. The National Clean Air Programme (NCAP) measures progress mainly by percentage cuts in PM10, which steered effort towards dust rather than the finer PM2.5, of which transport contributes around 40% in Delhi.
A Super El Niño, which helped push the national monsoon to a 13% deficit while Delhi saw a 17% surplus, may lower wind speeds, suppress the western disturbances that wash pollutants away and trap emissions near the ground.
Rainfall deficits of 23 to 40% in parts of Punjab and Haryana and a shift of stubble burning to evening hours that daytime satellites may miss, add regional pressure. The case is for airshed-based, science-driven management.
WHY IT MATTERS FOR UPSC & STATE PCS
As Delhi prepares its Winter Action Plan, an expert argues that city-centric measures and NCAP's PM10-based metric are inadequate. A Super El Niño and regional emissions call for an airshed approach to air quality.
Standard News
The Metric Rewarded the Wrong Fight
The question at the heart of Delhi's winter is not whether the city should act. It is where the boundary of action should be drawn. Should Delhi focus on the pollution it controls, within its own limits or should air quality be governed across the wider region that shares the same air?
The case for acting within the city There is a strong argument for city-centric action.
Accountability needs a clear owner. When Delhi runs road-sweeping machines, doubles parking charges or triggers work-from-home under GRAP, citizens know who acted and can judge the result. Much of Delhi's most harmful pollution is also local.
The transport sector accounts for about 40% of the city's PM2.5, the fine particles that do the most damage to health. Vehicles on Delhi's roads are within Delhi's control. Waiting for a regional consensus across several states risks delaying the measures that could help residents now.
Diffuse responsibility can easily become no responsibility.
The case for the airshed The opposing case begins with physics.
PM2.5 travels. Smoke from stubble in Punjab and Haryana, emissions from neighbouring industrial belts and Delhi's own traffic all mix in the same air over the Indo-Gangetic plain. A city boundary means nothing to a particle.
It also points to a design flaw in the National Clean Air Programme. NCAP measures progress largely by percentage reduction in PM10, the coarser particles to which dust contributes heavily. Funding and performance were therefore tied to fighting dust, a second- or third-tier contributor to the most harmful pollution, while transport's large share of PM2.5 drew less attention.
This winter adds a climatic multiplier. A Super El Niño, which helped produce India's highest monsoon deficit in a decade, may reduce wind speeds, suppress the western disturbances that wash pollutants away and lower the layer that traps air near the ground.
Rainfall deficits of 23 to 40% in parts of Punjab and Haryana and stubble burning reportedly shifting to evenings that daytime satellites may miss, all add regional pressure no city plan can address alone.
Where
TAN stands TAN's position is that air quality should be governed at the airshed level, with progress measured by PM2.5, while cities stay accountable for their own sources. The case for city action is right about accountability and about local sources such as transport.
It is wrong to treat the city as the whole system. A nested model fits the evidence: a regional airshed authority sets PM2.5 targets and coordinates neighbouring states on stubble, industry and forecasting, while Delhi remains answerable for its vehicles and local emissions.
The single most important reform is the metric. As long as funding rewards PM10 reductions, effort will flow towards the visible and the easy rather than the harmful. Linking NCAP's assessment to PM2.5 would point money where the health damage is.
Quick Facts
Key numbers & takeaways — revise these first
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Transport's share of Delhi's PM2.5 emissions: about 40%, according to SAFAR's assessment.
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NCAP: measures progress mainly by percentage reduction in PM10.
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PM10 versus PM2.5: dust is a major contributor to PM10; PM2.5 is finer, more harmful and travels farther.
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Delhi's Winter Action Plan measures include narrow road-sweeping machines, doubled parking charges and work-from-home provisions under GRAP.
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2026 southwest monsoon: 13% national rainfall deficit, the highest in a decade.
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Delhi's monsoon: 17% surplus.
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Parts of Punjab and Haryana: rainfall deficits of 23 to 40%.
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Expected El Niño effects on winter air (author's assessment): lower wind speeds, fewer western disturbances and a lower surface inversion layer.
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Stubble burning: reportedly shifting from morning to evening, so MODIS-based fire detection may miss fires.
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Worst pollution period in Delhi over the last decade: 5 to 10 November.
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NARFI: the National Air Quality Resource Framework of India, developed by NIAS under the Office of the Principal Scientific Adviser.
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SAFAR: System of Air Quality and Weather Forecasting and Research, India's first air-quality forecasting framework.
Connect the dots for your UPSC preparation.
Standard news covers the event. Log in to read our comprehensive analysis and uncover the hidden constitutional, structural, and ethical dimensions of this topic:
The fully built case for city-centric action, including why clear jurisdiction and Delhi's control over transport emissions matter.
The full airshed case: how PM2.5 crosses borders, how NCAP's PM10 metric misdirected funding and how a Super El Niño may trap pollution.
TAN's defended position for a nested model, with regional PM2.5 targets and city accountability and the evidence that would change our view.
A practical blueprint for reforming NCAP's metric and strengthening regional monitoring before the 5 to 10 November peak.
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