Atmospheric temperature | 4 - fair | Limited to high atmosphere. | Mm-submm spectrometry in 60-650 GHz range |
BrO* | 2 - very high | Limited to high atmosphere. | Mm-submm spectrometry. BrO lines around 640 GHz. |
ClO* | 2 - very high | Limited to high atmosphere. | Mm-submm spectrometry. ClO lines around 640 GHz. |
Cloud ice | 1 - primary | Limited to high atmosphere. | Mm-submm spectrometry in the 60-650 GHz range |
Cloud liquid water (CLW) | 4 - fair | Limited to high atmosphere. | Mm-submm spectrometer in the 60-650 GHz range |
H2O* | 4 - fair | Limited to high atmosphere. | Mm-submm spectrometry. H2O lines in bands 183, 325, 380, 448, 556 GHz, and others. |
HCl* | 3 - high | Limited to high atmosphere. | Mm-submm spectrometry. HCl lines in a band around 625 GHz |
HNO3* | 3 - high | Limited to high atmosphere. | Mm-submm spectrometry. HNO3 lines in bands around 190 GHz. |
N2O mole fraction* | 4 - fair | Limited to high atmosphere. | Mm-submm spectrometry. N2O lines in bands around 300 and 500 GHz. |
O3* | 4 - fair | Limited to high atmosphere. | Mm-summ spectrometry. Ozone lines around 240, 300 and 500 GHz. |
SO2* | 4 - fair | Limited to high atmosphere. | Mm-submm spectrometry. SO2 lines in bands around 640 GHz. |
Specific humidity | 4 - fair | Limited to high atmosphere. | Mm-submm spectrometry of water vapour bands at frequency up to 650 GHz (main: around 183, 325, 380, 448 and 556 GHz) |