As per the Central Pollution Control Board, Madikeri in Karnataka had the cleanest air in India on Thursday as its AQI was recorded at 10. Other cities with clean air were Palkalaiperur (17), Karur (22), Tirunelveli (23), Tirupati (24), Ooty (26), Vellore (26), Ranipet (26), Gadag (32), Thoothukudi (32) and Puducherry (34). Delhi's AQI was recorded at 424.