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The report introduces a Cellular Automation (CA) model that simulates pollen movement using a rectangular lattice to track how wind velocity and deposition probabilities affect the spread of pollen. By comparing simulations with observed data for grasses and maize, the authors found that the model can reproduce general deposition patterns. A key finding is the inherent 'patchiness' of pollen deposits, which suggests that fixed separation distances may be insufficient to prevent cross-contamination, particularly for GM maize in the UK, as pollen can travel significant distances via high-altitude currents.