Delhi ranked third among the most polluted cities (102 micrograms/m3 PM2.5) from January to June, according to CREA. Byrnihat led with 140 micrograms/m3, followed by Faridabad at 103. Delhi failed WHO guidelines for 182 days. Regions impacted included Haryana, Rajasthan, Uttar Pradesh, Assam, and Bihar. A comprehensive air-shed-level clean air plan is recommended.
