Emissions And Air Concentrations Of Pollutant For Urban Area Sources

Abstract

Urban air pollution estimation as well as greenhouse emissions rely on the
preparation of good source inventories. Depending on the desired temporal and geographical
scale of such inventories, two complementary calculations are generally proposed to estimate
these emissions: the top-down and the bottom-up approach. This paper is divided in two
sections, in the first part, a brief report of both methods are presented, applied to the mobile
urban sources, which is then used to prepare a gridded emission pattern. In the second part,
an urban area source dispersion algorithm is presented to compute the ambient concentration
using the calculated gridded emission pattern for any particular meteorological conditions.
The proposed method calculates the ambient concentration of the entire area, by convolving
the response of one unit cell with the gridded emission pattern of the area under study. This
method is computationally more efficient than applying the standard regulatory algorithms
for any area shape. The results are then applied on a geographical information system.