In this study a modelling system consisting of Mesoscale Model (MM5), Sparse Matrix Operator Kernel Emissions (SMOKE)
and Community Multiscale Air Quality (CMAQ) model has been applied to a summer photochemical period in southeast
England, UK. Ozone (O3), nitrogen dioxide (NO2) and particulate matter (PM2.5) concentrations modelled with different
horizontal grid resolutions (9 and 3 km) were evaluated against available ground-level observations from the UK Automatic
Urban and Rural Network (AURN) and London Air Quality Network (LAQN) for the period of 24–28 June 2001 with a focus
on O3 predictions.