Comparison of two atmospheric-dispersion models to assess farm-site exposure to sour-gas processing-plant emissions

  • Scott H
  • Soskolne C
  • Martin S
 et al. 
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We describe two approaches for exposure assessment that we used in a large-scale retrospective cattle study conducted in Alberta, Canada. Sulfur dioxide (SO2) was the surrogate measure of exposure to a complex mixture of combusted sour-gas emissions. Monthly air pollution dispersion modeling (1985-1994) (based on individual industrial source processing-plant engineering specifications, emission volumes, and meteorologic information) provided exposure isopleths of sulfur dioxide concentration from each of 231 sour-gas processing-plants across the province. In contrast, a simpler measure of proximity to source(s) of varying emission rates was applied in a geographical information system based on simplified pollution decay at increasing distances from each point source. Province-wide (663,000 km2) surface analysis (by exposure-level classification) produced a contingency coefficient of 0.68 between the two exposure estimates. Annual exposure estimates at the 1382 dairy and 5726 beef cow-calf farms studied were highly correlated over the 10-years period (rspearman= 0.82 and 0.83, respectively), while monthly exposure estimates were somewhat less correlated (rspearman= 0.80 and 0.82, respectively) for the two exposure assessment methods. Crude exposure estimates from each method were similar in both direction and magnitude. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Air pollution
  • Atmospheric-dispersion model
  • Environmental epidemiology
  • Exposure assessment
  • Geographical information system
  • Point source emissions

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  • H. Morgan Scott

  • Colin L. Soskolne

  • S. Wayne Martin

  • Erik A. Ellehoj

  • Robert W. Coppock

  • Tee L. Guidotti

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