Estimation of resuspended dust emission factors before, during and after road paving process in Bogota

Previous studies in Bogotá have shown that emissions of resuspended particulate matter constitute a significant part of the emissions inventory and have considerable impact on air quality. This research estimates resuspended dust emission factors before, during and after the pavement process of a secondary road in Bogota. The estimation of resuspended dust emission factors was obtained from measurements and data analysis of PM10, PM2.5 and BC concentrations and meteorological variables recorded near the road. Later, SCREEN3 and AERMOD models were applied to estimate emission factors. The estimated emission factors for unpaved road were 7.8 ± 0.5 g PM10/ VKT and 0.6 ± 0.2 gPM2.5/ VKT respectively, and for road construction of 28 ± 0,27µg PM10/m2*s and 11 ± 0,13 µg PM2.5/m2*s. The atmospheric dispersion modeling of resuspended particulate matter showed a reduction of the impact area in roughly 1km and more than 95% over concentration.