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GWP:  Global Warming Potential & Duration of Atmospheric Stay

Global warming potential (GWP) is a measure of how much a given mass of greenhouse gas is estimated to contribute to global warming. It is a relative scale which compares the gas in question to that of the same mass of carbon dioxide whose GWP is (1) one.
Carbon Dioxide has a GWP of exactly 1 and a duration of approximately 200-450 years.  (It is the baseline unit to which all other greenhouse gases are compared.)
Methane has a GWP of 21 and a duration of 12-15 years
Nitrogen Dioxide has a GWP of 310 and a duration of 120 years
Hydrofluorocarbon has a GWP of 11,700 and a duration of 12 years
Sulfur Hexafluoride has the highest charted GWP of 23,900, used as high voltage insulator and has a duration of 3,200 years.