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Evaluation of Emission Inventories
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
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Objective [Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section]
[Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section]
CB-IV = Carbon bond. IV chemical reaction mechanism scheme [Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section]
Caution: Ambient/emission inventory comparisons are useful for examining the relative composition of emission inventories; they are not useful for verifying absolute amounts unless they are combined with bottom-up evaluations. [Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section] Perform the following three tasks:
Conduct a second evaluation following the incorporation of the recommendations made in the first evaluation, in order to verify improvement. [Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section] AMBIENT DATA ISSUES
[Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section] EMISSION INVENTORY ISSUES
[Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section] EPS 2.0
EMS-95
Caution: Only actual chemical species should be used for the evaluation. An emission inventory speciated using CB-IV lumped species is not well-suited for top-down evaluations. EPS 2.0 and EMS-95 cannot currently speciate hourly gridded emission inventories in the format required for top-down evaluations. Additional processors need to be developed to speciate the hourly gridded inventories. [Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section]
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 1.
[Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section]
CASE STUDY: EVALUATION OF THE
EMISSION INVENTORY Analysis Objective Evaluate the consistency of a day-specific gridded, hourly, speciated emission inventory for the southeast Texas area with ambient NMHC and NOx data. Approach
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 2.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 3.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 4.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 5.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 6.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 7.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] NMHC emissions capable of being detected by the measurement system and NOx emissions by source category from 0100-0800 CST for the 9x9 cell (18x18 km) area surrounding Clinton (Houston), TX. (1993 COAST emission inventory data, TNRCC)
NMHC emissions capable of being detected by the measurement system and NOx emissions by source category from 0100-0800 CST for the 9x9 cell (18x18 km) area surrounding Galleria (Houston), TX. (1993 COAST emission inventory data, TNRCC)
Weight-percent contributions of NMHC emissions capable of being detected by the ambient measurement system to the total emissions in the inventory from 0100-0800 CST for the 9x9 cell (18x18 km) area surrounding Clinton and Galleria sites in Houston, TX. (1993 COAST emission inventory data, TNRCC)
The emissions of the NMHC considered in the evaluation contribute up to 70 percent of the total emissions in the inventory. [Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 8.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 9.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 10.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 11.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 12.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Effective plume heights for the elevated point sources located in the 81-cell (18x18 km) area surrounding Clinton and Galleria sites in Houston, TX. The effective plume heights were calculated using the Briggs Effective Plume Height Algorithm with Pasquill Stability Class of 5, wind speed of 1.5 m/s, temperature of 297 K, and pressure of 960 mb.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 13.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 14.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 15.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] August 19 0600 CST contributions of the various source categories (in mole percent NOx and mole C percent NMHC) to the emissions of paraffins, olefins, and aromatic compounds for the 9x9 cell (18x18 km) area surrounding Clinton and Galleria sites in Houston, TX. (1993 COAST emission inventory data, TNRCC)
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 16.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 17.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 18.
Comparison of the 0600 CST ambient- and total emissions-derived relative compositions of the most abundant chemical species for the 9x9 cell (18x18 km) area surrounding Galeria (Houston), TX. Note that the compositions of ethane, propane, and isopentane in the emission inventory are significantly lower than the ambient composition whereas the compositions of n-butane, isoprene, and toluene are significantly higher. (Ambient data, Level 1 AIRS; 1993 COAST emission inventory data, TNRCC) [Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 19.
Comparison of the 0600 CST ambient- and total emissions-derived relative compositions of the most abundant chemical species for the 9x9 cell (18x18 km) area surrounding Clinton (Houston), TX. Note that the compositions of ethane, acetylene, isopentane and cyclopentane in the emission inventory are significantly lower than the ambient composition whereas the compositions of n-butane, isoprene, and benzene are significantly higher. (Ambient data, Level 1 AIRS; 1993 COAST emission inventory data, TNRCC) [Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 20.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 21.
[Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 22.
Comparison of the 0600 CST ambient- and total emissions-derived reactivities of the most abundant chemical species for the 9x9 cell (18x18) area surrounding Galleria (Houston), TX. Note that the reactivities of propylene, 2-pentene, and 3-methyl-1-butene in the emission inventory are significantly lower than the ambient reactivities whereas the reactivities of isoprene and toluene are significantly higher. (Ambient data, Level 1 AIRS; 1993 COAST emission inventory data, TNRCC) [Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 23.
Comparison of the 0600 CST ambient- and total emissions-derived reactivities of the most abundant chemical species for the 9x9 cell (18x18 km) area surrounding Clinton (Houston), TX. Note that the reactivities of 2-pentene and 3-methyl-1-butene in the emission inventory are significantly lower than the ambient reactivities whereas the reactivities of isoprene and n-butane are significantly higher. (Ambient data, Level 1 AIRS; 1993 COAST emission inventory data, TNRCC) [Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 24.
Comparison of the 0600 CST ambient- and mobile source emissions-derived relative compositions of the most abundant chemical species for the 9x9 cell (18x18 km) area surrounding Galleria (Houston), TX. Note that the compositions of n-butane and benzene in the emission inventory are significantly higher than the ambient composition. (Ambient data, Level 1 AIRS; 1993 COAST emission inventory data, TNRCC) [Workbook Table of Contents] [Top of Evaluation of Emission Inventories] [Previous Section] [Next Section] Figure 25.
Comparison of the 0600 CST ambient- and point source emissions-derived relative compositions of the most abundant chemical species for the 9x9 cell (18x18 km) area surrounding Clinton (Houston), TX. Note that the compositions of n-butane, isobutane, n-hexane, and benzene in the emission inventory are significantly higher than the ambient composition whereas the compositions of acetylene, ethane, isopentane and cyclopentane are significantly lower. (Ambient data, Level 1 AIRS; 1993 COAST emission inventory data, TNRCC) [Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section] The uncertainties associated with top-down emission inventory evaluations can be divided into three categories: EMISSION INVENTORY UNCERTAINTY ISSUES
AMBIENT MEASUREMENTS UNCERTAINTY ISSUES
COMPARISONS-RELATED UNCERTAINTY ISSUES
[Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section]
[Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section] Carter W.P.L. (1991) Development of ozone reactivity scales for volatile organic compounds Report prepared for U.S. Environmental Protection Agency, Research Triangle Park, NC, EPA-600/3-91-050. Carter W.P.L. (1994) Development of ozone reactivity scales for volatile organic compounds. J. Air & Waste Manag. Assoc. 44, 881-899. Chinkin L.R., Korc M.E., and Janssen M. (1994) Comparison of emission inventory and ambient concentration ratios of NMOC, NOx, and CO in the Lake Michigan Air Quality Region. Paper presented at the "The Emission Inventory: Applications and Improvement" A&WMA International Specialty Conference, Research Triangle Park, NC, November. EMS95-Developed by Alpine Geophysics. Contact Lake Michigan Air Directors Consortium, 2350 E. Devon Ave., Suite 242, Des Plaines, IL 60018 (847)296-2181. EPS 2.0 - User’s guide for the Urban Airshed Model volume iv: User’s manual for the emissions processor system 2.0. Part A: Core Fortran System. U.S. EPA Office of Air Quality Planning & Standards, Research Triangle Park, NC 27711. EPA-450/4-90-007D(R) June 1992. Fujita E.M., Croes B.E, Bennett C.L., Lawson D.R., Lurmann F.W., and Main H.H. (1992) Comparison of emission inventory and ambient concentration ratios of CO, NMOG, and NOx in California's South Coast Air Basin. J. Air Waste Manage. Assoc. 42, 264-276. Fujita E.M. (1995) Evaluation of the emissions inventory in the South Coast Air Basin. In Proceedings of the Fifth CRC On-Road Vehicle Emissions Workshop, San Diego, CA, April 3-5, Coordinating Research Council, Inc., Atlanta, GA, pp. 1.17-1.33. Korc M.E., Roberts P.T., Chinkin L.R., and Main H.H. (1993) Comparison of emission inventory and ambient concentration ratios of NMOC, NOx and CO in the Lake Michigan Air Quality Region. Final report prepared for Lake Michigan Air Directors Association, Des Plaines, IL by Sonoma Technology, Inc., Santa Rosa, CA, October. Korc M.E., Jones C.M., Chinkin L.R., Main H.H., and Roberts P.T. (1995) Use of PAMS data to evaluate the Texas COAST emission inventory. Final report prepared for U.S. Environmental Protection Agency, Research Triangle Park, NC by Sonoma Technology, Inc., Santa Rosa, CA, December. Lurmann F.W. and Main H.H. (1992) Analysis of the ambient VOC data collected in the Southern California Air Quality Study. Report prepared for California Air Resources Board, Sacramento, CA by Sonoma Technology, Inc., Santa Rosa, CA, STI-99120-1161-FR, Contract No. A823-130, February. Magliano K.L. (1996) Descriptive analysis and reconciliation of emissions and ambient hydrocarbon data. Draft SJVAQS/AUSPEX technical topic team #5 report prepared by California Air Resources Board, Sacramento, CA. Main H.H., Roberts P.T., Chinkin L.R., and Korc M.E. (1997) PAMS data analysis workshop: illustrating the use of PAMS data to support ozone control programs. Prepared for U.S. Environmental Protection Agency, Research Triangle Park, NC, presented at Camp Mabry for Texas Natural Resources Conservation Commission, Austin, TX by Sonoma Technology, Inc., Santa Rosa, CA, STI-997160-1704-WD6, April. Pierson W.R., Gertler A.W., Robinson N.F., Sagebiel J.C., Zielinska B., Bishop G.A., Stedman D.H., Zweidinger R.B., and Ray W.D. (1996). Atmos. Environ. 30, 2233-2256. Stoeckenius T.E., Ligocki M.P., Shepard S.B., and Iwamiya R.K. (1994a) Analysis of PAMS data: application to summer 1993 Houston and Baton Rouge data. Draft report prepared by Systems Applications International, San Rafael, CA, SYSAPP94-94/115d, November. Yarwood G., Grey H.A., Ligocki M.P., and Whitten G.Z. (1994) Evaluation of ambient species profiles, ambient versus modeled NMHC:NOx and CO:NOx ratios, and source receptor analysis. Final report prepared for U.S. Environmental Protection Agency, Office of Mobile Sources, Research Triangle Park, NC by Systems Application International, San Rafael, CA, SYSAPP94-94/081, September. [Workbook Table of Contents] [Top of Evaluation if Emission Inventories] [Previous Section] [Next Section] |
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