case study 4 [CITY]

thermal inversion normal pattern pollutants escape into the stmosphere when warm air rises thermal inversion a layer of warm air overlies and traps pollutants in cool air below urban aerodynamics street orientation - enhance summer breeze penetration - provide shelter from chilling winter winds dispersion of airborne pollutants mitigation of high speed wind gusts - pedestrian level near highrise mitigation of wind damage - tornado in high latitude - hurricane in low latitude urban energy form wind turbines airborne distribution of toxic materials Reference: _ http://www.partnersinair.org/en/images/curr_unit1b_bkgd1_figure110.jpg _ http://www.globalchange.umich.edu/gctext/Inquiries/Inquiries_by_Unit/Unit_9.htm _ http://www.nrc-cnrc.gc.ca/eng/ibp/irc/cbd/building-digest-174.html _ Booklet on Wind engineering in urban aerodynamics