Abstract

Pollution data that are emitting from urban transporta-tion sys-tems, are normally collected at some heights and a little far from the vicinity of  roads. And are underes-timating pollutant concen-trations in mi-croenvironments (vehicle inside, sidewalks, corri-dors etc.). Based on this underpredicted data all major deci-sions are made for  urban planning,  traffic management, and in new construction pro-jects (roads, intersec-tions etc.). When urban roads are located be-tween high-rise buildings,  pollutants coming from  road traffics are entrapped into street canyons and are severely exposed to the road commuters (drivers, people walking through footpath). This study is conducted using a stochastic  model of emission expansion for an urban road. The influence of wind speed on the removal rate of pollu-tants is investigated. It is found that for wind speed from 1.5 to 3.5 m/sec around 40 to 80% of the pollutant can be transported from the road environ-ment, in comparison to the level of pollutant at critical wind situa-tion (1m/sec). Two particular pollu-tants namely, Carbon monox-ide (CO) and Nitrogen Oxides (NOx) are accounted for.