AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Commuter Exposure to Particle Matter and Carbon Dioxide inside High-speed Metro Cabins
PENGYI CUI, Bin Xu, Tongji University
Abstract Number: 13 Working Group: Indoor Aerosols
Abstract In-cabin exposure to PM2.5 and CO2 were investigated inside standard high-speed metro cabins under a variety of passenger numbers and ventilation conditions in China. The mean PM2.5 and CO$_2 concentrations inside the metro cabins were observed at ~0.07 mg m$^(-3) and 1200 ppm. PM2.5 and CO$_2 distribution were similar under different conditions (cabin classes, passenger numbers, and ventilation modes). The PM2.5 concentrations at passenger breathing zone and ventilation recirculation vents were found ~20% greater than the ventilation supply air. As passenger number increased from 10 to 80, PM2.5 and CO$_2 concentrations increased 10-20% with the greatest increases occurred at passenger breathing zone. It was found that PM2.5 and CO$_2 concentrations were inversely proportional to the air exchange rate (AER) inside cabins. ~25% of PM2.5 concentration reduction was observed as the AER increased from 2.7 h$^(-1) to 12 h$^(-1). Greatest in-cabin PM2.5 concentration (0.18±0.02 mg m$^(-3)) was obtained at dinning cabin, while the PM2.5 concentrations at other cabin classes were found to be similar. In-cabin air distribution posed a negligible effect on the in-cabin PM2.5 and CO$_2 concentration.