The simulated emission stack established by the NIEA was used to improve the inspecting ability of domestic environmental inspection companies. This stack can generate stable velocity, particle mass concentration and temperature for the tester to carry out the PM measurement. By accumulating comparison data, the relationship between different velocity and the mass concentration is established as a way to evaluate the inspecting ability of the inspection industry The mass concentration provided by the stack is ranged from 20 ~ 300 mg/Nm3，and the velocity is ranged from 1 ~ 10 m/s, the temperature is ranged from room temperature to 80 ℃. This project also collects testing parameters from each test in order to find out the source of bias. Five models were evaluated to improve the accuracy of the stack standard. This project also evaluated the suitability of five PM monitors for recording the mass concentration. The calibration and maintenance had been done and 20 companies had completed the test. 18 of 20 companies had also completed low mass concentration tests. The results are similar to the model build in 2019 and also similar to the theoretical values. This prove the reliability of the stack. The DS model is more representative for predicting the mass concentration of the stack. The photometer was suggested to monitor the mass concentration in the stack. Because the particle composition is stable and the photometer with fast response time can have the best performance.

PM sampling, stack, particulate matter