||Relationships between Direction of Wind Flow and Fine Particle Sulfur Concentrations within and Upwind of St. Louis, MO. (Journal Version).
Altshuller, A. P. ;
||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Wind direction ;
Air pollution ;
Rural areas ;
Photochemical reaction ;
Diurnal variations ;
Air quality data ;
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The relationships between the monthly averages of diurnal fine particle sulfur concentrations and wind flow direction with season of the year are evaluated using measurements at urban and rural locations within the St. Louis area. The results confirm and quantify the regional contribution to fine particle sulfur concentrations within the St. Louis urban area. The contribution of local scale photochemical oxidation of SO2 to particle sulfur to SO2 is estimated as is the contribution of local scale direct emissions of particle sulfur. Evidence is provided of downward mixing during the morning hours of fine particle sulfur along with O3 from layers aloft. A positive gradient in fine particle sulfur concentrations from west to east is confirmed which is shown to be primarily the result of much lower concentration in flow from the northwest of the St. Louis area. These results are consistent with other monitoring measurements available from midcontinental non-urban locations.