Geography Reference
In-Depth Information
Fig. 16.1
The three local monitor sites and the 119 major industrial point sources in Franklin
County, Ohio
the dispersal patterns if mountainous or hilly regions are present. However, since
Franklin County is relatively flat, topographic influences on pollution dispersion are
minimal in this study although they were incorporated in the model.
Another component that was added to the pollution estimates generated by the
dispersion model was the level of background concentrations, which accounted for
the pollution from all other sources that were not considered by the dispersion
model. In this study, these other sources included major industrial sources located
outside of Franklin County, minor sources that do not have emission inventories
(restaurants, auto body shops, gas stations, and dry cleaners), mobile sources,
fugitive emissions (land fills, storage piles), dust from unpaved roadways, and envi-
ronmental tobacco smoke. These concentration values were obtained from the three
local monitoring sites, all located within 6 km from the city center of Columbus.
These values were then extrapolated to create a continuous surface covering the
entire study area and added onto the results of the estimated concentrations from
the air dispersion model.
The second type of data used in this study was an activity-travel diary dataset
collected in the 1999 Mid-Ohio Area Household Travel Survey. The data were
collected by the Mid-Ohio Regional Planning Commission (MORPC) over a 5-
month period from February to June 1999 from 5,555 households located in
Franklin County and several adjacent countries. About 13,500 individuals and
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