point source, on-road motor vehicles, non-road motor vehicles and biogenic emissions, as well as

a number of supporting modules, including spatial allocation factor development, speciation

profile development, growth and control for point and area sources, and CEM point source

emissions handling. Additional work by the emissions modeling community has begun

development of CEM preprocessing software, graphical QA tools, and an interface to the traffic

demand models for on-road motor vehicle emissions estimation.

Biogenic emissions Estimates for biogenic emissions can be made using the BEIS emissions

model (Geron, et al., 1994). The BEIS3 model estimates CO, NOx, and VOC emissions from

vegetation and soils in the gridded, hourly, and model-species forms needed for air quality

modeling. Guenther, et al., (2000) contains the technical development and review of BEIS3.

Vukovich, et al., (2002) summarizes new input data and algorithms as implemented within

SMOKE. Arunachalam, et al., (2002) presents the impact of BEIS3 emissions on ozone. For

more detailed local estimates, a State or Tribe should review the biogenic emissions on a county

basis and update as needed the spatial patterns of land use data. BEIS3.13 was the latest version

of BEIS3 in use by EPA at the time this document was written.

Other models for biogenic emissions include the BIOME model that is a part of EMS-

2001, the Global Biosphere Emissions and Interactions System (GloBEIS), and the Model of

Emissions of Gases and Aerosols from Nature (MEGAN). GloBEIS estimates emissions from

natural (biogenic) sources and is designed for use in combination with photochemical modeling

systems, such as CAMx (http://www.globeis.com/). The MEGAN model is available from


All of the biogenic models require a mix of land uses to be specified for each county or

grid cell, as well as hourly temperature and in some cases other meteorological data. If a State or

Tribe believes the average land use mix characterized for a county is inappropriate for certain

gridded locations within a county, this may be overridden for the grid cells in question on a case

by case basis.


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