Disparate PM2.5 Metrics from Measurement and Modelling: Implications for Assessing PM2.5 Regulatory Compliance

A study has been done to investigate the difference in the modelled bound water component of PM2.5 air mass concentration when modelled to correspond to different measurement methods. The study found that the June average PM2.5 air mass concentration along a transect through southern England for a 2020 emissions scenario differed by 89 % when modelled corresponding to the two different measurement methods. It is, therefore, clear from this study that careful consideration needs to be taken to ensure that the modelled PM2.5 air mass concentration corresponds to the appropriate measurement method.