MODEL FOR TRAFFIC EMISSIONS ESTIMATION

A model is developed for the spatial and temporal evaluation of traffi c emissions in metropolitan areas based on sparse measurements. Ah tra ffic data available are fully employed and the pollutant emissions are determined with the highest precision possible. The main roads are re garded as line sources of constant traffic parameters in the time inte rval considered. The method is flexible and allows for the estimation of distributed small traffic sources (non-line/area sources). The emis sions from the latter are assumed to be proportional to the local popu lation density as well as to the traffic density leading to local main arteries. The contribution of moving vehicles to air pollution in the Greater Athens Area for the period 1986-1988 is analysed using the pr oposed model. Emissions and other related parameters are evaluated. Em issions from area sources were found to have a noticeable share of the overall air pollution.