Measurement and analysis of particle concentration distribution in a subway station in northern cities

This paper measures the particle concentration in a subway station with a screen door system in a northern city. The test area includes meeting rooms and offices in the working area and platforms in public areas, and the measured particle includes total suspended particulates (TSP), inhalable particle (PM10) and  fine particulate matter (PM2.5). The concentration levels, variation characteristics, and size distribution of particle in different regions are analysed. The results show that the concentration of indoor particle in the working area is lower than that in the outdoor area, and it is greatly influenced by the outdoor area, but it is hardly influenced by the public area. The particle concentration on the platform is higher than that outside, and it is slightly affected by piston wind. The values of PM2.5/PM10 in the platform and the working area are very close, ranging from 0.7 to 0.8, but the values of PM10/TSP in the working area (0.25 and 0.15) are much lower than that in the platform (0.80). This shows that different mitigation measures for the main particle size need to be formulated for the public area and working area of the subway.