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KEY: N = data do not exist; R = revised; U = data are not available.
a Figures obtained by addition / subtraction and may not appear directly in data source.
b Urban consists of travel on all roads and streets in urban places of 5,000 or greater population.
c 1960-90 includes Motorcycle data.
d Involvement only with motor vehicle.
e 1960 included in Single-unit 2-axle 6-tire or more truck in Truck Profile.
f 1960-90...
KEY: CAFE = Corporate Average Fuel Economy; GVWR = gross vehicle weight rating; kmpl = kilometers per liter; R = revised; U = data are not available.
a Data from 2007 were calculated using a new methodology developed by FHWA. Data for these years are based on new categories and are not comparable to previous years. The new category Light duty vehicle, short wheel base replaces the old category Passenger car and includes passenger cars, light trucks, vans and sport utility vehicles with a wheelbase (WB) equal to or less than 121 inches. The...
KEY: Btu = British thermal unit; N = data do not exist; U = data are not available.
a Motorcycle was included in Light duty vehicle, short wheel base (previously Passenger car) in 1960 and 1965.
b 1960-99 data are for Passenger car and Other 2-axle, 4-tire vehicles, respectively. The data from 1960-2006 are not comparable to the data from 2007-15.
c Energy Intensity (Btu/passenger-mile) is calculated by converting the fuel consumption in gallons to the energy equivalent Btu units and dividing by the passenger-miles. The heat equivalent factor used for Btu...
KEY: NA = not applicable.
a From 2004 onward, the Carpool categories are 2-person and 3+ person; 4+ person is the sum of 4-person, 5-6 persons, and 7+ persons from the source data.
bPublic transportation refers to bus, streetcar, subway, railroad, and elevated trains for years 1989-2001, and includes ferryboats from 2002-14.
c From 1989 to 2001, Bicycle data are included under Motorcycle.
d Other means include ferryboats, surface trains, and van...
KEY: CO2 = carbon dioxide; R = revised; Z = a value of zero, or value too small to report.
a Hydrocarbon Gas Liquids (HGL) includes ethane, propane, normal butane, isobutane, and natural gasoline, and their associated olefins. Excludes Liquified Natural Gas (LNG).
KEY: AQI = Air Quality Index; R = revised.
KEY: R = revised.
aIndustrial processes consists of chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; solvent utilization; and storage and transport.
KEY: R = revised.
a Fine particulate matter less than 10 microns. Data include PM without condensable.
bIndustrial processes consists of chemical and allied product manufacturing, metals processing, petroleum and related industries, other industrial processes; solvent utilization; and storage and transport.
c In 1985 there appears to be a spike in Miscellaneous emissions. This is likely due to a methodological change, and the EPA does not change historical data when it changes its methodology....