Northern Front Range air quality study: Apportionment of carbonaceous particles
- Desert Research Inst., Reno, NV (United States)
- Colorado State Univ., Fort Collins, CO (United States)
The Chemical Mass Balance (CMB) receptor model was applied to source profiles and ambient measurements taken during Winter 1997 at locations near Denver, CO. Chemical speciation included particulate and gaseous polycyclic aromatic hydrocarbons and other organic compounds (e.g., methoxylated phenols, hopanes, steranes, sterols, and lactones) in combination with inorganic particulate species and total elemental and organic carbon. Emissions were tested for more than 200 in-use vehicles, including heavy-duty trucks and buses, light-duty diesel vehicles and, smoking and high emitting gasoline vehicles. Separate profiles were obtained for light-duty vehicle for cold-start and hot stabilized modes. Wood burning and meat cooking emissions were also characterized. Motor vehicles account for about 85 percent of the ambient PM2.5 carbon in Denver and about 75 percent in areas north of Denver. Light-duty gasoline vehicles are the major sources of PM2.5 carbon in Denver, with cold starts (or high emitters) and smokers contributing about 30 percent each to PM2.5 carbon. Normal hot stabilized emissions and diesel exhaust contribute about 5 and 17 percent, respectively, and paved road dust contributes less than 5 percent. Smokers, and cold starts (or high emitters) are the largest contributors to PM2.5 organic carbon, and diesel exhaust, and cold starts (or high emitters) are the largest contributors to PM2.5 elemental carbon. PM2.5 emissions from the exhaust of light-duty gasoline vehicles are seriously underestimated in current inventories relative to diesel exhaust. Diesel exhaust, which is about two-thirds of the on-road vehicle PM2.5 emissions in the current inventory, account for only 18 percent according to the ambient source apportionment.
- OSTI ID:
- 362000
- Report Number(s):
- CONF-980632-; TRN: IM9933%%384
- Resource Relation:
- Conference: 91. annual meeting and exhibition of the Air and Waste Management Association, San Diego, CA (United States), 14-18 Jun 1998; Other Information: PBD: 1998; Related Information: Is Part Of Proceedings of the 91. annual meeting and exhibition. Bridging international boundaries: Clean production for environmental stewardship; PB: [5000] p.
- Country of Publication:
- United States
- Language:
- English
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