Ghaziabad was the most polluted city, recording an average PM2.5 concentration of 172 g/m³, followed by Noida (166 g/m³), and Delhi (163 g/m³), as per CREA, a Finland-based independent research group.
Ghaziabad was the most polluted city, recording an average PM2.5 concentration of 172 g/m³, followed by Noida (166 g/m³), and Delhi (163 g/m³), as per CREA, a Finland-based independent research group.
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