MAO/NFOV/M1 - Channels over-ranging/saturation
The NFOV is a zenith pointing instrument with a very narrow field-of-view. As such the signals measured are typically very small. In Brazil there are times when the sun is close to directly overhead. When this occurs the channels saturate.
Remove data when channel(s) are saturated using the embedded quality control fields failing the valid_min limit. The CIMEL might be an option as an alternate.