Field survey of particulate matter mass concentration and exposure levels in a commercial garage in dalian, China

Özet

Due to the enclosed environment and large quantities of particulates in vehicle exhaust, shopping mall parking garages are a hotspot for exposure to pedestrians and staf. This study conducted two-week continuous ield measurements focusing on traic and pedestrian lows, thermal environment, and particle mass concentrations in a commercial garage in Dalian, China. The relationship between traic low and thermal environmental parameters, and its efect on particle mass concentration, was evaluated based on Pearson correlation analysis. The particle mass concentrations both inside and outside the garage, and the relative exposure in the garage compared to the rest of the day, were analyzed. Results demonstrated that hourly averaged PM2.5 mass concentration exceeded China's 35 μg/m3 long-term (one year) and the 70 μg/m3 short-term (24 h) exposure limits by 54.8% and 22.2%, respectively. For 92% of the time, the PM2.5 cumulative dose was higher inside the garage than outdoors. The available natural ventilation was insuicient to prevent unsafe levels of exposure to particulate matter in the garage.