According to data released by the Central Pollution Control Board, Uttarakhand's Kashipur has the cleanest air on Monday with an air quality index (AQI) of 17. The other cities with the cleanest air on Monday are Firozabad (22), Varanasi (29), Dehradun (30), Tumakuru (31), Moradabad (34), Gorakhpur (39), Vijayapura (39), Khurja (40), Lucknow (40) and Arrah (41).