United States Department of Transportation
i
Develop a Performance Metric to Quantify the Inhalation of Traffic-Related Air Pollutants at Mesoscale
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2022-11-01
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[PDF-1.00 MB]
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Edition:Final April 1, 2022–June 30, 2022
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Abstract:This study attempts to develop a health risk metric to quantify the inhalation of traffic-related air pollutants at a finer geographic level. In this study, northern Orange County and western Riverside County in California are selected as the study area. The concentration of particulate matter 2.5 microns or less in width (PM2.5) and the cancer risks based on 9-year exposure to traffic-related exhaust diesel PM2.5 are assessed at the census block level. The Orange County blocks generally have higher primary traffic-related PM2.5 concentration than the Riverside County blocks do. Within selected Orange County blocks, the gasoline and diesel PM2.5 concentrations are comparable. However, within selected Riverside County blocks, the average diesel PM2.5 concentration is slightly higher than the average gasoline PM2.5 concentration. The estimated cancer risks show that to limit cancer risks to within the 75th percentile (14.5 in 1 million) of the study area, a “safe” distance would be 1,500 to 2,000 meters away from major freeways. The health risk values estimated in this study can be applied to evaluate cumulative health risks. For example, the values can be combined with existing screening tools to provide a layer of traffic-related air pollutant concentration and health risks that show detailed intra-urban variation.
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