Delhi's Winter Pollution Curbs Return: Do Past Stage IV Measures Work?

Delhi has reimposed its winter pollution curbs, and the question is whether they deliver results. Past episodes indicate that the city's air quality index has frequently improved after Stage IV of the graded response plan takes effect. On 17 January 2026 the AQI was 400, and within a week it had fallen to 192. A comparable pattern appeared in November 2023, when the index dropped from 454 to 218 over the same timeframe.
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