Performance comparison of particular matter (PM2.5) sensors for testing indoor natural dust

In order to evaluate the performance of PM2.5 sensors such as precision and stability, chooses five models of PM2.5 sensors commonly used (two sets for each model), selects the gravimetric method defined in the national standard as reference method, collects 30 samples of natural dust in the indoor environment, and compares the measurement results of the PM2.5 sensors and the gravimetric method by means of parallel test. The comparison results indicates that the mean relative error of the selected sensors is more than 20%, up to about 60%. Based on the test results under different working conditions, the minimum relative overall uncertainty of the sensors is about 60%, and the maximum one is more than 150%. By comparing the testing data of two sensors from the same model, finds that the maximum consistence of internal is up to 25%.