Assessment of traffic related air pollution in urban areas of Macao

A method that enables the user to assess air pollution originated from vehicle emission in the urban center was described by taking Macao as an example. The method involved the use of mathematical models for the calculation of urban pollutant emissions and concentrations, of which a revised MOBILE5 was adopted to calculate the emission factors and two dispersion models of CAR and OSPM were used to calculate the long term and short term concentrations within street canyons, respectively. The results show consistency with the monitoring data, and some conclusions of controlling vehicle emissions are given based on the calculation results.