According to data by Central Pollution Control Board, cities with AQI below 50 are Agartala, Ariyalur, Chhapra, Davanagere, Gadag, Guwahati, Haveri, Kalaburagi, Karur, Madikeri, Madurai, and Maihar. Others on the list are Nagapattinam, Namakkal, Ooty, Perundurai, Puducherry, Salem, Shillong, Shivamogga, Silchar, Sivasagar, Thanjavur, Thoothukudi, Tirunelveli, Tirupur, Udupi, Vellore and Yadgir.