Nonroad Mobile- For nonroad mobile sources, the emissions should be compiled as country,

state/tribe, county and SCC totals. For activities other than aircraft, locomotives, and marine,

inventory developers should use the most current version of EPA’s NONROAD model

(http://www.epa.gov/oms/nonrdmdl.htm) or alternative model. The California OFFROAD

model should be preferentially used for emissions in California, available at

http://www.arb.ca.gov/msei/msei.htm. Since the NONROAD model does not include emissions

of aircraft, locomotives, and commercial marine vessels, these emissions should be estimated

using other approaches described as follows:

Aircraft emissions should ideally be calculated based on airport-specific landing and

takeoff activity data and the Federal Aviation Administrations (FAA) Emissions Data

and Dispersion Model (EDMS), available at

http://www.faa.gov/about/office_org/headquarters_offices/aep/models/edms_model/.

Although aircraft emissions may be at the county and SCC level, point

(latitude/longitude) or shape file spatial resolution may be desirable (but possibly

more challenging to use in emissions models). County emissions of aircraft at airports

can be allocated to point locations using emissions modeling features, such as the

SMOKE area-to-point feature.

• Railroad emissions should ideally be calculated at the county and SCC level using

fuel usage activity data distributed among train types (e.g., long haul, yard,

passenger) and rail ton/miles data.

• Commercial marine vessel emissions should ideally be calculated at the county and

SCC level by fuel/cargo activity, or by growth from previously determined inventory

efforts. The emissions are distributed to ports and cargo lanes by activity data.

County emissions of port-based emissions can be allocated to point locations using

emissions modeling features, such as the SMOKE area-to-point feature.

 

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