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The trajectory model is used to predict episodes of photochemically generated pollutants in the summer, where long-range transport is an important factor in producing high UK concentrations. It uses the output of numerical weather prediction models as its input, and predicts how air masses have been transported for the preceding 96 hours. These pathways are known as "back trajectories". The model uses a simplified chemical scheme to predict the formation of ozone as the air travels to the UK. Concentrations of the secondary particle contribution to PM10 are also predicted by this model |
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