API PUBL 4642-1996

$39.65

A Study to Quantify On-Road Emissions of Dioxins and Furans from Mobile Sources: Phase 2

Published By	Publication Date	Number of Pages
API	1996	93

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Description

This report describes the results of a study of the on-road emissions of dioxins and furans from mobile sources. This work was done in response to the US EPA's draft Dioxin Reassessment document which used data from sources outside the US to estimate an emission factor for the US fleet. The EPA estimate for dioxin emissions from the heavy-duty fleet was 0.8 rig/mile expressed in terms of TEQ or Toxicity Equivalents (a set of factors intended to adjust concentrations based on relative toxicity). The primary objective of this work was to develop on-road chlorinated dioxin and furan emission factors for in-use vehicles operating in the US with particular emphasis on heavy-duty vehicles. The experimental approach was to measure emissions in the Fort McHenry Tunnel, Baltimore, Maryland. All air entering and leaving the tunnel was sampled for concentrations of dioxins and furans (during ten sampling periods of 24 hours each). The difference between the mass of material entering and the mass of material leaving the tunnel was taken to be the amount produced by the vehicles in transit. These measurements were combined with information on vehicle counts (obtained through videotapes) and tunnel length to determine an average emission factor. The study was conducted from October 25 to November 6, 1995. The average heavy-duty diesel emission factor determined in this study was 0.28 ng TEQ/mile.

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