THRESHOLD FOR RELEASES
	to air kg/year	to water kg/year	to land kg/year
Carbon dioxide (CO2)	100 million	-	-
Hydro-fluorocarbons (HFCs)	100	-	-
Methane (CH4)	100 000	-	-
Nitrous oxide (N2O)	10 000	-	-
Perfluorocarbons (PFCs)	100	-	-
Sulphur hexafluoride (SF6)	50	-	-