NA Not available.
1 Covers only CFC-11, CFC-12, and CFC-113.
2 Covers principally HCFC-22.

Source: U.S. Energy Information Administration, Emissions of Greenhouse Gases in the United States, annual.

http://www.eia.doe.gov/environment.html#GHG

*Carbon dioxide:

A colorless, odorless, non-poisonous gas that is a normal part of the ambient air. Carbon dioxide is a product offossil-fuel combustion. Although CO2 does not directly impair human health, it is a greenhouse gas that traps the earthsheat and contributes to the potential for global warming.

Chlorofluorocarbons (CFCs):

A family of inert, nontoxic, easily liquefied chemicals used inrefrigeration, air conditioning, packaging, and insulation, or assolvents or aerosol propellan

Greenhouse gases:

Those gases, such as water vapor, carbon dioxide,tropospheric ozone, nitrous oxide, and methane, that aretransparent to solar radiation but opaque to longwaveradiation, thus preventing longwave radiation energy fromleaving the atmosphere. The net effect is a trapping ofabsorbed radiation and a tendency to warm the planetssurface.

Halons (Bromofluorocarbons):

Inert, nontoxic chemicals that have at least one bromine atomin their chemical makeup. They evaporate without leaving aresidue and are used in fire extinguishing systems, especiallyfor large computer installations.

Hydrochlorofluorocarbons (HCFCs):

Chemicals composed of one or more carbon atoms andvarying numbers of hydrogen, chlorine, and fluorine atoms.

Hydrofluorocarbons (HFCs):

Chemicals composed of one or two carbon atoms andvarying numbers of hydrogen and fluorine atoms.

Methane:

A hydrocarbon gas (CH4) that is the principal constituent ofnatural gas.

Methyl chloroform (trichloroethane):

An industrial chemical (CH3CCl3) used as a solvent, aerosolpropellant, and pesticide and for metal degreasing.

Nitrogen oxides (NOx):

Compounds of nitrogen and oxygen produced by the burningof fossil fuels.

Nonmethane volatile organic compounds (NMVOCs):

Organic compounds, other than methane, that participate inatmospheric photochemical reactions.

Perfluorocarbons (PFCs):

Chemicals composed of one or two carbon atoms and four tosix fluorine atoms, containing no chlorine. PFCs have nocommercial uses and are emitted as a byproduct of aluminumsmelting.

Volatile organic compounds (VOCs):

Organic compounds that participate in atmosphericphotochemical reactions.

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