Atmospheric temperature | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry. |
C2H2 | 4 - fair | Limited to high atmosphere. | TIR spectrometry. C2H2 lines around 7.5 and 13.7 micrometers. Limb sounding mechanically or electronically |
C2H6 | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry. C2H6 lines around 3.3 and 12 micrometers. |
CFC-11 | 4 - fair | Limited to high atmosphere. | TIR spectrometry. CFC-11 lines around 9.2 and 11.7 micrometers. Limb sounding mechanically or electronically |
CFC-12 | 4 - fair | Limited to high atmosphere. | TIR spectrometry. CFC-12 lines around 8.8 and 10.8 micrometers. |
ClONO2 | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry. ClONO2 lines around 5.7, 7.7 and 12.5 micrometers. |
COS | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry. COS lines around 4.8 and 11.6 micrometers. |
HNO3 | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry. HNO3 lines around 5.9, 7.6 and 11.3 micrometers. |
N2O5 | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry. N2O5 lines around 5.8 and 8 micrometers. |
NO | 4 - fair | Limited to high atmosphere. | MWIR spectrometry. NO lines around 5.3 micrometers. |
NO2 | 4 - fair | Limited to high atmosphere. | TIR spectrometry. NO2 lines around 6.1 micrometers. |
O3 | 4 - fair | Limited to high atmosphere. | TIR spectrometry. Ozone band around 9.7 micrometers. Limb sounding mechanically or electronically |
PAN | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry. PAN lines around 5.7, 8.6 and 12.5 micrometers. |
PSC occurrence | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry. Limb sounding mechanically or electronically |
SF6 | 4 - fair | Limited to high atmosphere. | TIR spectrometry. SF6 lines around 10.5 micrometers. Limb sounding mechanically or electronically |
SO2 | 4 - fair | Limited to high atmosphere. | TIR spectrometry. SO2 lines around 7.3 and 8.6 micrometers. |
Specific humidity | 4 - fair | Limited to high atmosphere. | MWIR and TIR spectrometry in the water vapour band around 6.3 micrometers |