Table 1,,,,,,
Mobile Source Air Toxics (MSATs): 1996,,,,,,
,Highway motor vehicles,Nonroad vehicles and engines,Total mobile sources,,,
,,National,,National,,National
,,total,,total,,total
MSAT,Short tons,(percent),Short tons,(percent),Short tons,(percent)
Acetaldehyde,"28,700",29,"40,800",41,"69,500",70
Acrolein,"5,000",16,"7,400",23,"12,400",39
Arsenic compounds,0.25,0.06,2.01,0.51,2.26,0.57
Benzene,"168,200",48,"98,700",28,"266,900",76
"1,3-butadiene","23,500",42,"9,900",18,"33,400",60
Chromium compounds,14,1.2,35,3,49,4.2
Dioxin/furans,0.0001,0.2,NA,,0.0001,0.2
Diesel exhaust (PM),data not yet available,,,,,
Ethylbenzene,"80,800",47,"62,200",37,"143,000",84
Formaldehyde,"83,000",24,"864,000",25,"169,400",49
Lead compounds,19,0.8,546,21.8,565,22.6
Manganese compounds,5.8,0.2,35.5,1.3,41.3,1.5
Mercury compounds,0.2,0.1,6.6,4.1,6.8,4.2
MTBE,"65,100",47,"53,900",39,"119,000",86
n-Hexane,"63,300",26,"43,600",18,"106,600",44
Naphthalene,data not yet available,,,,,
Nickel compounds,10.7,0.9,92.8,7.6,103.5,8.5
POM (sum of 7 PAHs),42,4,19.3,2,61.3,6
Styrene,"16,300",33,"3,500",7,"19,800",40
Toluene,"549,900",51,"252,200",23,"802,100",74
Xylene,"311,000",43,"258,400",36,"569,400",79
 Totals,"1,394,892",,"1,695,337",,"2,312,329",
KEY: MTBE = methy-tertiary-butyl-ether; NA = not applicable; PAHs = polycyclic aromatic hydrocarbons; PM = particulate matter; POM = polycyclic organic matter.,,,,,,

"NOTE: EPA estimates these data based on engine type. Thus, highway motor vehicles includes both gasoline- and diesel-powered vehicles such as light duty vehicles and trucks, heavy duty vehicles, and motorcycles. The nonroad vehicles and engines category data are estimated based on engine types normally used by aircraft, marine vessels, and locomotives. However, this category can also include engines for lawn, construction, and other equipment that the Bureau of Transportation Statistics does not consider to be transportation-related sources of nonroad emissions. Currently, it is not possible to subtract these data from the totals, as is done for criteria pollutants.",,,,,,

"SOURCE: U.S. Environmental Protection Agency, National Vehicle and Fuels Emission Laboratory, “Control of Emissions of Hazardous Air Pollutants from Mobile Sources,” 65 Federal Register 48058, 2001."