| Click to rotate molecule |
Concentration Units* (Click to see graph) |
Ozone Depleting Potential** |
Atmospheric lifetime (years)** |
|
|---|---|---|---|---|
| Carbon dioxide CO2 |
 |
 ppm  long term |
0 |
300-1000 |
| Methane CH4 |
 |
 ppb  long term |
0 |
11.8 |
| Nitrous oxide N2O |
 |
 ppb  long term |
0.017 |
109 |
| Ozone O3 |
 |
 ppb  Total column (Dobson) |
hours-days |
|
| Hydrogen H2 |
 |
 ppb |
0 |
1-2 |
| Carbon monoxide CO |
 |
 ppb |
0 |
0.25 |
Trichlorofluoromethane CCl3F CFC-11 |
 |
 ppt |
1 |
52 |
| Dichlorodifluoromethane CCl2F2 CFC-12 |
 |
ppt |
0.82 |
102 |
| Trichlorotrifluoroethane CCl2FCClF2 CFC-113 |
 |
ppt |
0.85 |
93 |
| Carbon tetrachloride CCl4 |
 |
ppt |
0.82 |
32 |
| Chloroform CHCl3 |
 |
 ppt |
0.01 |
0.501 |
| Dichloromethane CH2Cl2 |
 |
 ppt |
0.004 |
0.493 |
| Difluoromethane CH2F2 HFC-32 Component (50%) of R-410A |
 |
 ppt |
0 |
5.4 |
| Methyl chloride CH3Cl |
 |
 ppt |
0.02 |
0.9 |
| Tetrachloroethene Cl2C=CCl2 Perchloroethylene (perc) |
 |
ppt |
0.007 |
0.301 |
| Methyl chloroform CH3CCl3 |
 |
 ppt |
0.16 |
5 |
| Chlorodifluoromethane CHClF2 HCFC-22 |
 |
 ppt |
0.04 |
11.9 |
| Chlorodifluoroethane CH3CClF2 HCFC-142b |
 |
 ppt |
0.06 |
18 |
| Dichlorofluoroethane CH3CFCl2 HCFC-141b |
 |
ppt |
0.12 |
9.4 |
| Difluoroethane CH3CHF2 HFC-152a |
 |
ppt |
0 |
1.6 |
| Tetrafluoroethane CH2FCF3 HFC-134a |
 |
ppt |
0 |
14 |
| 1,1,1-Trifluoroethane CH3CF3 HFC-143a |
 |
 ppt |
0 |
51 |
| Pentafluoroethane CHF2CF3 HFC-125 Component (50%) of R-410A |
 |
ppt |
0 |
30 |
| 2,3,3,3-Tetrafluoropropene CF3CF=CH2 HFO-1234yf |
 |
? |
0 |
0.033 |
| Propane CH3CH2CH3 |
 |
? ppt |
0.02 |
0.036 |
| 1,1,1,3,3-Pentafluorobutane CF3CH2CF2CH3 HFC-365mfc |
 |
ppt |
0 |
8.9 |
| Fluoroform CHF3 HFC-23 |
 |
 ppt |
0 |
228 |
| Perfluoroethane CF3CF3 PFC-116 |
 |
 ppt |
0 |
10,000 |
| Bromochlorodifluoromethane CBrClF2 Halon-1211 |
 |
 ppt |
7.9 |
16 |
| Methylbromide CH3Br |
 |
ppt |
0.66 |
0.8 |
| Dibromotetrafluoroethane CBrF2CBrF2 Halon-2402 |
 |
ppt |
13.0 |
28 |
| Bromotrifluoromethane CBrF3 Halon-1301 |
 |
ppt |
15.9 |
72 |
| Sulfur hexafluoride SF6 |
 |
ppt |
0 |
3,200 |
| Trifluoromethyl sulfur pentafluoride CF3SF5 |
 |
 ppt |
0 |
800 |
| Nitrogen trifluoride NF3 |
 |
ppt |
0 |
569 |
| Carbon tetrafluoride CF4 PFC-14 |
 |
 ppt |
0 |
50,000 |
*Concentration data from the Scripps CO2 Program,
the Advanced Global Atmospheric Gases Experiment (NASA and the MIT Center for Global Change Science),
Global Greenhouse Gas Reference Network (U. S. National Oceanic and Atmospheric Administration),
and the World Data Centre for Greenhouse Gases (Japan Meteorological Agency).
**The Ozone Depletion Potential (ODP) is used to contrast different gases and provides a simple measure
of the expected impact on ozone per unit mass emission of a gas relative to that caused by CFC-11 defined as 1.
Atmospheric lifetime is used to characterize the decay of an instanenous pulse input to the atmosphere,
and represents the time the input would take to decay to 0.368 (1/e) of its original value.
Atmospheric lifetimes taken from Intergovernmental Panel on Climate Change, Climate Change 2021:
The Physical Science Basis, Table 7.SM.7, p. 24-35.
ODP values from World Meteorological Organization,
Scientific Assessment of Ozone Depletion: 2018, Table A-1 and
United States Environmental Protection Agency, Ozone-Depleting Substances.
Earlier versions of these pages were supported by the National Science Foundation grants DUE-9455918 and DUE-9455924.
This page created by George Lisensky, Beloit College. Last modified August 15, 2022.