U.S. Environmental Protection Agency
Office of Mobile Sources
April 1999


MOBILE5b input and output files used for generating
Heavy-Duty Gasoline Vehicle NOx and Exhaust VOC inventories.  

HDG04306= baseline, HDG0430 = control

These files reflect 47-state annual basis.  Generation of 
emission rates and calculation of emission inventories is 
detailed in "Development of Heavy-Duty Gasoline Emissions
Inventories for the Tier 2/Sulfur NPRM", Memorandum
From John Koupal to Docket A-97-10.

Development of the mileage accumulation rates and
age distributions used in the input files is detailed in 
"Modifications to Heavy-Duty Diesel Emission Rates, Heavy-Duty
Mileage Accumulation, and Age Distributions for the 
Tier 2/Sulfur NPRM", Memorandum from Janet Kremer to Docket A-97-10.