Question raised in Rajya Sabha on Air pollution in metro cities, 06/02/2017. Central Pollution Control Board (CPCB) and State Pollution Control Boards (SPCBs)/Pollution Control Committees (PCCs) monitors the ambient air quality at 680 monitoring stations located in 300 cities/towns covering 29 states and 6 union territories across the country under National Air Quality Monitoring Programme (NAMP). The ambient air quality data for metro cities during 2014-2016 is given at Annexure. CPCB has issued directions to non-attainment cities for implementation of measures to mitigate air pollution in 2016.