PARIS will intercompare top-down and bottom-up emissions estimated at national scale for the following gases in 8 focus countries:
| Country | Substance |
| United Kingdom | CO2, CH4, N2O, F-gases |
| Ireland | CH4, F-gases, Aerosol |
| Netherlands | CO2, CH4, N2O, F-gases |
| Germany | F-gases, CH4, N2O |
| Switzerland | CH4, N2O, F-gases |
| Italy | F-gases, CH4, Aerosol |
| Norway | F-gases |
| Hungary | CH4, N2O, F-gases |
