TNPCB stands for Tamil Nadu Pollution Control Board which is a body which makes sure that industries/businesses are working within the regulated limits of pollution/combustion levels in state of Tamil Nadu and Provides No Objection certificate to every business according to their category based on the level of pollutant an industry/establishment releases, these NOC (no objection certificate) comes in two steps namely CTE/CTO i.e. Consent to Establish and Consent to Operate.