出版社：Chinese Association for Aerosol Research in Taiwan
摘要：Recent literature suggests that particle toxicity increases with decreasing particle diameter andincreasing total particle surface area. Most inexpensive particle monitors are based upon lightscattering and tend to lose sensitivity for particles with diameters less than about 0.3–0.35 µm.This raises the question of whether the measurement of PM2.5 “misses” the potential impact ofvery small particles (e.g., below 0.3 µm) due to lack of sensitivity and/or the low mass concentrationsthat these particles contribute to the total PM2.5. On the other hand, measuring only ultrafineparticles (e.g., below 0.1 µm) would exclude significant numbers of still very small particles. Thefocus of simulating a novel particle monitor in this study, is to address limitations in currentinexpensive particle monitors, and to realize a particle monitor that may be more relevant toadverse health outcomes by measuring both PM0.3 and PM2.5. The monitor uses optical scatteringtechniques, measuring light scattering by the particles at two forward angles, to determine PM0.3and PM2.5. Experimental data from particle monitor prototypes that were developed show goodagreement with simulation results. Such a monitor, that is low-cost and easy to use, can provideinformation directly to the users so that they can be driven to action. In particular, low-incomecommunities that are often impacted by poor air quality will be able to more affordably determinereal-time ambient conditions and drive positive change by helping to identify pollution sourcesand appropriate mitigation measures.
