Air Emission Monitoring on Stacks / Chimney is stated in Environmental Quality (Clean Air) Regulations 1978. This Stack Monitoring Service has become one of the essential tests to be carried-out by taking samples using isokinetic and non isokinetic methods according to the demands of the clients. Our company also provides Dark Smoke Observation test on the stack emission. It is provided to capture particulates that pass through a definite area without altering the travel paths. The gas velocity of the sampling probe's nozzle is equal to the moving stack gas velocity. It is disturbed as little as possible to make the particles go into the probe nozzle in the same amount.