Indore city in Madhya Pradesh has been named the cleanest city for the fourth time in a row in the category of more than one lakh population, the Ministry of Housing and Urban Development announced during the Swachh Survekshan 2020 award ceremony on Thursday.Karnataka's Mysuru city had won the award in the first edition of the survey in 2016, while Indore retained the top position for three consecutive years.Indore is followed by Surat, Gujarat and Navi Mumbai, Maharashtra in the same category.Meanwhile, in the category of less than one lakh population, Karad, Saswad and Lonavala cities in Maharashtra emerged victorious.Chhattisgarh ranked first in the category of best performing states with more than hundred urban local bodies, while Jharkhand topped the list in the less than one hundred urban local bodies category.India's cleanest cantonment was awarded to Jalandhar in Punjab and best Ganga town was given to Varanasi in Uttar Pradesh.Swachh Survekshan, meant to monitor the performance of Swachh Bharat Abhiyan, was launched in 2014.This year, the survey was conducted in 4,242 cities, 62 cantonment boards and 92 Ganga towns and completed in 28 days.