In support of the latest Canadian smog assessment, simulations of current and projected levels of ozone and PM2.5 were performed with Environment Canada multi-pollutant model. AURAMS simulates the interaction through gaseous, aqueous and heterogeneous reactions of 42 gas-phase species and up eight chemical components of particulate-matter segregated in 12 size bins, namely sulphate, nitrate, ammonium, black carbon, primary organic carbon, secondary organic carbon, crustal material and sea salt. For the purpose of this study, Canadian and American national emission inventories corresponding to 2002, for the present day simulation, and 2015, for the future day simulations, were used, while the meteorological reference year was kept constant (2002). The differing trends in the projected evolution of ozone and PM2.5 will be discussed in light of the projected emission changes and seasonal response of the chemical system.