documentation for the onroad national emissions inventory nei base years 1970 2002 prepared office of air quality planning and standards emission factor group us environmental protection agency research triangle park nc 27711 by eh pechan & associates inc 5528 b hempstead way springfield va 22151 january 2004 this page intentionally left blank iii contents a introduction 1 what is 2 purpose document 3 which sources does epa include in on road vehicle category s current methodology developing criteria pollutant hap estimates vehicles through data use estimating vmt how estimate miles traveled develop projected 6 c were state incorporated into 7 factors 8 temperature input to mobile model calculate monthly rvp inputs 9 diesel fuel sulfur
