Sampling methods and analysis
The air pollutants investigated in this study included: carbon monoxide (CO), sulfur oxide (SO2), nitrogen oxide (NO-NO2-NOx), volatile organic compounds (VOCs), airborne particulate matters with aerodynamic diameters less than 10 microns (PM10) and 2.5 microns (PM2.5), and Methane, Non-methane hydrocarbons (NMHC) and THC.