Response of SIA concentrations across Germany to emission changes during PM10 episodes in Spring 2009

The Chemistry Transport Model (CTM) REM-Calgrid (RCG) has been applied to investigate the non-linear relationship between emission changes and modelled SIA (=SO4 + NO3 + NH4) concentrations for a high PM10 episode in spring 2009. Emissions were reduced for the model domain only and the model domain including Boundary Conditions. It was found that the effectiveness of emission reductions increases with increasing emission reduction area whereas results were least dependent on the size of emission reduction area for ammonia emission changes.