Air pollution in the Northern states saw a sharp spike in November , with 20 of 29 NCR cities reporting higher PM 2.5 levels compared to the same period last year. Ghaziabad also emerged as the most polluted in the country last month, a new analysis has shown.

The report by the Centre for Research on Energy and Clean Air (CREA) showed that the NCR city recorded PM 2.5 levels of 224 µg/m³.

CREA, an independent research organisation that analyses pollution trends and their causes, analysed nation-wide PM 2.5 levels — fine particles smaller than 2.5 microns, width of a fraction of human hair that pose serious health risks. The study stated that pollution levels in the NCR cities were the worst in the country even when farm-fire contributions showed a dip, indicating the role of local emis

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