Delhi remains the worst-affected state in three of the four seasons, with a yearly population-weighted PM2.5 average of 101 µg/m³, nearly 2.5 times the national standard and 20 times the WHO benchmark.

Delhi emerges as India’s most polluted region: Here's what CREA study finds more on major AQI breach

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Delhi emerges as India’s most polluted region: Here's what CREA study finds more on major AQI breach