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The Role of Weather in Air Pollution Weather plays a large role in the transport of pollution. Winds carry ozone, fine particle pollution and acid rain to areas beyond our urban centers and industrial corridors where the source pollution is emitted. Mountainous areas can receive more pollution at high elevation than in adjacent valleys due to winds moving faster, less impeded aloft. One way scientists can track where pollution comes from is using “back trajectories” of wind fields. Using wind direction data from National Weather Service sites flow paths can be generated going backwards in time to show where an air mass came from. The images below, created from the VIEWS back trajectory tool, shows different back trajectories, as dotted lines, to Mount Washington on days when the air pollution varied.
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