Category
Group
Subgroup
NameYears of accessibilityData accessibility levelDescription
 total 1998-2016NTS-4, NTS-5-
 total (excluding carbon dioxide) 1996-2016NTS-4, NTS-5-
 fugitive 1998-2016NTS-4, NTS-5-
 sulphur dioxide 1996-2016NTS-4, NTS-5-
 nitrogen oxides 1996-2016NTS-4, NTS-5-
 carbon monoxide 1998-2016NTS-4, NTS-5-
 carbon dioxide 1998-2016NTS-4, NTS-5-
 methane 1998-2016NTS-4, NTS-5-
 dinitrogen monoxide 1998-2016NTS-4, NTS-5-