| Code/Flag Figure |
Description |
Status |
|
0
|
Ozone
(O3)
(10028-15-6)
|
Operational
|
|
1
|
Water vapour
(H2O)
(7732-18-5)
|
Operational
|
|
2
|
Methane
(CH4)
(74-82-8)
|
Operational
|
|
3
|
Carbon dioxide
(CO2)
(124-38-9)
|
Operational
|
|
4
|
Carbon monoxide
(CO)
(630-08-0)
|
Operational
|
|
5
|
Nitrogen dioxide
(NO2)
(10102-44-0)
|
Operational
|
|
6
|
Nitrous oxide
(N2O)
(10024-97-2)
|
Operational
|
|
7
|
Formaldehyde
(HCHO)
(50-00-0)
|
Operational
|
|
8
|
Sulphur dioxide
(SO2)
(7446-09-5)
|
Operational
|
|
9
|
Volcanic sulphur dioxide
|
Operational
|
|
10-24
|
Reserved
|
Operational
|
|
25
|
Particulate matter < 1.0 microns
|
Operational
|
|
26
|
Particulate matter < 2.5 microns
|
Operational
|
|
27
|
Particulate matter < 10 microns
|
Operational
|
|
28
|
Aerosols (generic)
|
Operational
|
|
29
|
Smoke (generic)
|
Operational
|
|
30
|
Crustal material (generic dust)
|
Operational
|
|
31
|
Volcanic ash
|
Operational
|
|
32
|
Cloud
|
Operational
|
|
33
|
Cloud and aerosols
|
Operational
|
|
34-200
|
Reserved
|
Operational
|
|
201-254
|
Reserved for local use
|
Operational
|
|
255
|
Missing value
|
Operational
|