Assessing Ozone Distribution Vertically and Horizontally in Urban Street Canyons Based on Field Investigation and ENVI-met Modelling

High concentrations of ozone (O3) is a major air problem in urban areas, which creates serious threat to human health. Urban street canyon morphology plays key role pollutant dispersion and photochemical reaction rate. In this study, one-year observation at three height levels was performed investigate the O3 distribution vertically Shenyang. Then, field investigation ENVI-met modelling were conducted quantify influence microclimatic factors on pedestrian level. All high from 1:00 p.m. 4:00 Both level middle 40% higher than roof accumulated canyons rather spread out. The in-canyon had significantly positive correlations with building height, aspect ratio, sky view factor, temperature, wind speed. found medium canyons. Photochemical intensity played more important dispersion. Wide favorable for removing O3.