The organization structure of TNPCB is a three-tier system consisting of an Head-office at Chennai, Zonal offices and District offices with a total staff strength of 623. Besides, which a separate wing of laboratories are linked to the offices at three levels. The Board has 7 Regional Offices headed by Joint Chief Environmental Engineers. Further there are 38 district offices headed by District Environmental Engineers. Two flying squads are also functioning at Erode and Tiruppur. To assist the Board in monitoring the industries, 8 Advanced Environmental Laboratories, 8 District Environmental Laboratories are functioning. These laboratories carry out analysis of samples of sewage, trade effluent, emission and hazardous waste.