The Central Pollution Control Board on Thursday released a list of pollution levels in Indian cities. Delhi was listed as the most polluted city with very poor air quality index (AQI) of 306. This is followed by Meerut (293), Ghaziabad (272), Bhiwani (266), Jind (261), Hapur (261), Charkhi Dadri (260), Jhunjhunu (260), Baghpat (257) and Hanumangarh (255).