| Description |
MAX-DOAS (Multi-Axis Differential Optical Absorption Spectroscopy) is a powerful ground-based technique used to measure formaldehyde (HCHO) total columns, providing vertical profiles and linking surface measurements to satellites by observing scattered sunlight at different elevation angles, revealing HCHO as a key indicator of VOC oxidation, with typical measurements showing varying concentrations depending on location (urban, rural, biomass burning) and seasonal cycles, often complementing satellite data. |