Meteorological Influences on Seasonal Variation of Fine Particulate Matter in Cities over Southern Ontario, Canada

<table>A weather map on June 18, 2006, at 7:00 am EST. The contour lines show the surface pressure and green areas are with precipitation. Fronts are in blue and red. The arrow indicates direction of winds. “High” or “Low” indicates a high pressure (anticyclone) or low pressure (cyclone) system.</table>

Advances in Meteorology

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Figure 7

Figure 7: Meteorological Influences on Seasonal Variation of Fine Particulate Matter in Cities over Southern Ontario, Canada 