AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Commuters' Exposure to PM2.5 and CO2 in Metro Carriages of Shanghai Metro System
HAO GU, Bin Xu, Tongji University
Abstract Number: 10 Working Group: Indoor Aerosols
Abstract A comprehensive measurement campaign was conducted to examine the commuters' exposure to PM2.5 (diameter<=2.5 micro-meter) and CO2 in metro carriages under different conditions. The average PM2.5 and CO$_2 concentrations inside all the measured five metro lines were found to be 0.084 ± 0.042 mg/m$^3 and 1253.1 ± 449.1 ppm (parts per million), respectively. The factors that influence the PM2.5 and CO$_2 concentrations were quantitatively investigated. The in-carriage PM2.5 concentrations are greatly affected by the ventilation systems, out-carriage PM concentrations and the passenger number. The largest in-carriage PM2.5 and CO$_2 concentrations at 0.132 mg/m$^3 and 1855.0 ppm were observed inside the carriage equipped with the oldest ventilation systems. The average PM2.5 and CO$_2 concentrations increase up to 24.14% and 9.93% as the metro driving from underground to overground. The average in-carriage PM2.5 and CO$_2 concentrations increase 17.19% and 26.97% as the metro drives from urban to the suburban area. It was observed that PM2.5 concentration is proportional to the on-board passenger number at a ratio of 0.0004 mg/m$^3 per passenger. A mathematical model that incorporates all the above parameters is established to estimate the in-carriage PM2.5 concentration.