MAX-DOAS
Multi-Axis Differential Optical Absorption Spectrometer

The Multi-Axis Differential Optical Absorption Spectrometer (MAX-DOAS) is a ground-based passive spectrometer. It measures scattered solar light at different elevations to identify trace gases in the troposphere. MAX-DOAS is designed to have low residual error in the ultraviolet and visible spectra, enabling detection in both clean and polluted environments. Typical MAX-DOAS instruments operate in the 300-700 nm spectral range with a spectral resolution of 0.4-1.5 nm depending on the target species.