November 2025 has emerged as one of the most polluted months in recent memory for Delhi–NCR, with all of India’s ten most polluted cities falling within the region. Ghaziabad led the national charts, while Delhi itself settled at fourth place, revealing the alarming state of air quality in the nation’s capital. Only Bahadurgarh in Haryana managed a glimmer of clean air, while the rest of the top 10 failed to record a single day within safe limits, according to the Centre for Research on Energy and Clean Air (CREA).The interconnected nature of pollution in the NCR means that emissions from one city do not stay confined; they affect the entire region, turning the area into a vast, smog-covered cluster.Delhi recorded a monthly average PM2.5 concentration of 215 micrograms per cubic metre (µg/

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