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How did CATF determine that the cancer risk posed by diesel soot is higher than all other air toxics combined?

April 26, 2017air cancer catf determine diesel posed risk SOOT toxics

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How did CATF determine that the cancer risk posed by diesel soot is higher than all other air toxics combined?

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The calculated average US cancer risk of 363 cancers per million is over 8 times higher than the cancer risk of all other air toxics combined. The relative cancer risk of diesel PM is calculated as a ratio of the cancer risk of diesel PM divided by the cancer risk of other air toxics tracked by EPA. We calculated the cancer risk for diesel PM in the US by multiplying the CA cancer unit risk for diesel PM by the average national ambient concentration for diesel PM from Aspen model results for 1999. According to the 1999 NATA the combined risk from all 133 other air toxics tracked by EPA is 41.5 per million. Note: this risk is for inhalation as the only route of exposure. The relative ratio of national diesel soot risk to the risk of all other air toxics combined is therefore 363 / 41.5 = 8.75. County and state ratios were calculated similarly. MSA results were derived from the county-level data using population weighting.