Dealing with Delhi's invisible smog trap

Why early gains feel frustrating, and what the Capital must do next

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On severe pollution days in Delhi, frustration feels universal.

Governments may feel they have acted, but the results appear evasive. Scientists understand the problem, but recognise the limits of intervention. Regulators confront enforcement gaps in a system shaped as much by chemistry and weather as by policy. Citizens endure air that remains punishing despite years of action. Across institutions and society, emotion converges on disappointment, tempered by the belief that progress will eventually arrive.

That dissonance reflects a familiar trajectory in air-quality management, when visible pollutants give way to invisible ones. For much of the past decade, Delhi focused, correctly, on what was overwhelming and measurable. PM10, and later PM2.5, showed massive exceedances. Dust, fly ash, open burning, dirty fuels, and gross emitters dominated both monitoring data and lived experience. The priority was obvious: Control what is directly emitted, immediately harmful, and against which measures are enforceable. That sequencing was not a choice; it was a necessity. The transition of public transport to CNG, tighter fuel standards culminating in BS-VI, and emergency measures such as GRAP were appropriate responses to the problem as it then existed.