MODELING PHOTOCHEMICAL SMOG IN THE PERTH REGION

A three-year study of the occurrence of photochemical smog in the vici nity of Perth, Western Australia is being conducted by the State Energ y Commission (''SECWA'') and the W.A. Department of Environmental Prot ection (''DEP''). The project, termed the Perth Photochemical Smog Stu dy (''PPSS'') includes extensive monitoring of smog components and met eorological variables, development of an inventory of emissions of smo g precursors, and modelling of the combined effects of smog chemistry and meteorological transport. The Urban Airshed Model (''UAM'') has be en used for initial photochemistry studies. Input data have been obtai ned from surface measurements and the author's own mesoscale meteorolo gical model. While the Urban Airshed Model has proved to have limitati ons in its application to the Perth region, model results have highlig hted a number of issues. These, and implications for further work, are described.