The invention relates to a method and a device for measuring at least one atmospheric parameter (gas, temperature) implementing steps of acquiring spectral images in the ultraviolet and / or the visible and / or the infrared and scanning according to a tomographic principle. The spectral images are acquired using a network of optical systems (1A-1D) such as infrared cameras, and are used to estimate the air quality and / or meteorological and / or climatic parameters of a geographic area, for example an urban agglomeration.
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