Improved Emission Inventories Through Advances

in Methods and Models

J. David Mobley1, Sue Kimbrough2, William B. Kuykendal3,
U.S. Environmental Protection Agency, Office of Research and Development, NERL1, NRMRL2
Office of Air and Radiation, Office of Air Quality Planning and Standards3

Vision:

•	Produce an emission inventory that includes all significant emissions, from ail sources, for all
time periods, in all areas, with quantified uncertainties, and is accessible in a timely manner.

Research Goal:

•	Produce an emission inventory that is complete, accurate, timely, transparent, and
affordable.

Results/Conclusions

Impacts/Outcomes

Future Directions

' Biogenics Quantification - Control strategy shift from VOC to NOX

' Mobile - Improved mobile emission estimation techniques including modal
modeling and spatial and temporal improvements (MEASURE model)

' NH3 Characterization - Improved air quality modeling of PM secondary
organic aerosols.

' SPECIATE VOC and PM Emission Profiles - Improved source receptor and
air quality modeling capabilities.

' Fires - Improved spatial and temporal characterization of open burning
activities for modeling PM and regional haze.

' Toxics Measurement and Characterization - Improved national and local
assessment risks.

' Dyno/On-Road Engine Testing - Improved mobile source emission
characterization of heavy-duty, light-duty, and small, non-road engines.

Emission inventories are the foundation of cost-
effective air quality management strategies.

Improvements in emission inventories have enabled
assessment and policy regulatory development for
ozone, PM, air toxics, regional haze, and global
climate programs.

Influence improvements to MOBILE and design of
MOVES.

SIP response being changed due to better
understanding of emission inventories, meteorology
and atmospheric chemistry.

Address NRC, CAAAC, and NARSTO
recommendations on emission inventories:

1.	Address priority source categories

2.	Improve speciation estimates

3.	Improve existing and develop new emission
inventory tools

4.	Quantify and report uncertainty

5.	Increase inventory compatibility and
comparability

6.	Improve user accessibility

7.	Improve timeliness

8.	Asse ss and improv e em ission proj ections

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