Moneycontrol.com. Karnataka's capital, Bengaluru, improved its ranking in the national Clean Air Survey 2026, but trailed behind other metropolitan cities like Delhi, Mumbai and Hyderabad. Bengaluru: When it comes to air quality, Bengaluru has been ranked 32nd among 48 cities with populations above 10 lakh in the Swachh Vayu Sarvekshan 2026, securing a final score of 152.6.The.