Estimated U.S. Emissions of Nitrogen Oxides

KEY: R = revised.

^aIndustrial processes consists of chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; and solvent utilization, storage, and transport.

Estimated U.S. Emissions of Carbon Monoxide

KEY: R = revised. 

^aIndustrial processes consists of chemical and allied product manufacturing, metals processing, petroleum and related industries, other industrial processes; and solvent utilization, storage, and transport.

U.S. Air Carrier Aircraft Departures, Enplaned Revenue Passengers, and Enplaned Revenue Tons

KEY: R = revised.

^a Total performed includes scheduled departures performed minus those scheduled departures that did not occur plus unscheduled service.

^b The number of persons receiving air transportation from an air carrier for which remuneration is received by the carrier, excluding persons receiving reduced rate charges, such as air carrier employees, infants, and others (except ministers of religion, elderly individuals, and handicapped individuals).

^c The number of short tons transported on a...

Estimated National Average Vehicle Emissions Rates per Vehicle by Vehicle Type Using Reformulated Gasoline and Diesel

KEY:  CO = carbon monoxide; HC = hydrocarbon; NOx = nitrogen oxide; RFG = reformulated gasoline; R = revised. 

Estimated U.S. Average Vehicle Emissions Rates per Vehicle by Vehicle Type Using Gasoline, Diesel, and Electric

KEY: Btu = British thermal unit; CO = carbon monoxide; CO2 = carbon dioxide; HC=hydrocarbons; N = data do not exist; NOx= nitrogen oxides; P = projection; PM2.5 = particulate matter with diameter <=2.5 micrometers; R = revised.

^a Total HC includes exhaust and evaporative emissions.

^b Motorcycle emission rates were last analyzed in 2010.

^c For electric vehicles, total HC and exhaust CO, NOx, PM2.5 and CO2 g/mile values are zero.

Roadway Vehicle-Miles Traveled (VMT) and VMT per Lane-Mile by Functional Class

^a Includes the 50 States and the District of Columbia.

^bUrban other arterial includes other freeways and expressways, other principal arterial, and minor arterial. Rural other arterial includes other principal arterial and minor arterial prior to 2009, and includes other freeways and expressways, other principal arterial and minor arterial for 2009.

^cCollector is the sum of major and minor collectors.

Federal Exhaust Emissions Standards for Locomotives

KEY: bhp-hr = brake horsepower-hour; CO = carbon monoxide; g = gram; HC = hydrocarbon; NOx = nitrogen oxides; PM = particulate matter; hp = horsepower; U = data are not available. 

^a Standards apply to locomotives that are propelled by engines with total rated horsepower (hp) of 750 kilowatts (kW) (1006 hp) or more, unless the owner chooses to have the equipment certified to meet the requirements of locomotives. This does not include vehicles propelled by engines with total rated horsepower of less than 750 kW (1006 hp); see the requirements in 40 Code of Federal...

U.S. Vehicle-Miles

KEY: N = data do not exist; R = revised; U = data are not available.

^a All operations other than those operating under 14 CFR 121 and 14 CFR 135. Data for 1996 are estimated using new information on nonrespondents and are not comparable to earlier years. Mileage in source is multiplied by 1.151 to convert to nautical-miles for 1985-1997.

^b 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...

Energy Intensity of Passenger Modes (Metric)

KEY: Btu = British thermal unit; N = data does not exist; 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 new category Light duty vehicle, long wheel base replaces Other...

U.S. Government Energy Consumption by Agency and Source (Metric)

KEY: Btu = British thermal unit; DHS = Department of Homeland Security; FY = fiscal year; GSA = General Services Administration; N = data do not exist; NASA = National Aeronautics and Space Administration; R = revised.

^a Includes all U.S. government agencies not separately displayed. See http://ctsedwweb.ee.doe.gov/Annual/Report/AgencyReference.aspx for agency list.

^b Includes liquefied petroleum gas and Navy special fuel oil.