U.S. Carbon Dioxide Emissions from Energy Use by Sector

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). 

Air Pollution Trends in Selected Metropolitan Statistical Areas

KEY:  AQI = Air Quality Index; R = revised.

Estimated U.S. Emissions of Sulfur Dioxide

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. 

Estimated U.S. Emissions of Particulate Matter (PM-2.5)

KEY: R = revised.

^a Particulate matter less than 2.5 microns in size. Data include PM without condensable.

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

Estimated U.S. Emissions of Particulate Matter (PM-10)

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....

Estimated U.S. Emissions of Volatile Organic Compounds

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 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...

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.