Online Measurement Method for Condensable Particulate Matter Based on an Innovative Dilution Cooling Chamber

Condensable particulate matter (CPM), a significant environmental and health concern, has garnered extensive attention from researchers. The current lack of comprehensive and reliable online measurement methods for CPM has become a hindrance, limiting progress in both CPM research and environmental regulations. Therefore, this study designed an innovative dilution cooling sampling device to address this challenge, which, combined with a β-ray absorption dust detector and an Electrical Low Pressure Impactor (ELPI+), successfully achieved the online measurement of CPM concentration and particle size characteristics. The experimental results indicate a similar trend between online and offline measurement outcomes. This method can achieve online measurements of CPM concentration and particle size characteristics. The data obtained through online measurement methods exhibit slight dispersion. However, the proposed method offers a novel perspective for measuring CPM and even total particulate matter. This method not only enhances the efficiency of CPM research, but also paves the way for the implementation of online supervision of CPM emissions—an advancement crucial for environmental oversight.