Air quality

Air quality uses satellite atmospheric composition observations to map tropospheric pollutants including nitrogen dioxide, sulfur dioxide, ozone, aerosols, and formaldehyde for public health, emissions, and compliance workflows.^[1][2]

UV-VIS atmospheric spectroscopy is the primary EO modality for trace-gas column retrieval, with aerosol and ozone workflows using UV/VIS observations and supporting model assimilation.^[1][3]

Sentinel-5P provides global atmospheric composition products, and TEMPO provides geostationary daylight observations over North America.^[2][1]

Tropospheric column retrievals directly map nitrogen dioxide and sulfur dioxide columns for urban, industrial, shipping, and volcanic pollution questions, while atmospheric limb and nadir sounding supports ozone, water vapour, nitrogen dioxide, and related atmospheric composition profiles or columns.^[1][2]

Multisensor spatiotemporal fusion can gap-fill cloudy or sparse pollutant time series when blended with models and ground networks, and the resulting outputs remain model-dependent rather than direct observations.^[1][2]