Air Pollution Control Division (APCD) is one of the major R & D division of CSIR-NEERI. Research in air quality management by inventory, monitoring, prediction, simulation, data analysis and control is within the domain. Emission inventory followed by dispersion modelling using state-of-the-art models like AERMOD and CALPUFF for impact identification. Monitoring of pollutant is aimed towards regulatory compliance and receptor modelling objectives. Our laboratory is well equipped with analysers for chemical speciation of particulate matter. Source apportionment studies using CMB of ambient air PM has helped reveal several challenging tasks particularly for coal mine area and industrial sectors.