Check the latest AQI readings for New Delhi, Mumbai, Bengaluru, Chennai, Hyderabad and Kolkata. The deterioration comes days after Delhi recorded its cleanest October air in over a decade, with Stage I restrictions under GRAP now in force. Delhi's real-time AQI peaked at 512 as November's high-pollution period began. Authorities have tightened office, construction and vehicle restrictions across Delhi-NCR.