The Centre, under its National Clean Air Programme (NCAP) launched in January 2019 to take dedicated action in 102 cities, had set a national target of reducing key air pollutants PM10 and PM2.5 (particulate matters) by 20-30% by 2024 taking 2017 as the base year. The Central Pollution Control Board (CPCB) has added 20 more cities from eight states to the list of polluted cities which do not meet the National Ambient Air Quality Standards, taking the total to 122.