P.: A multi-wavelength approach to the retrieval of tropospheric NO2

Nitrogen oxides play an important role in the chemistry of earth’s atmosphere. In the troposphere, they provide the only chemical source for ozone, arguably the most important radical in the lower atmosphere. Nitrogen oxides are central in the formation of photochemical smog in the industrialised countries and also in regions with intense biomass burning. In addition to its relevance to tropospheric chemistry, the NO2 radical may also contribute locally to radiative forcing in th