Better accuracies can be expected with multi-channel and multi-angle approaches, which will be an option with added instrumentation on newer satellites. Quantitative accurate aerosol retrievals over land remain a challenge. The dark pixel approach is not only rather limited spatially but may be limited to provide rough estimates only. The concept of polarization retrievals needs to be further explored, in particular with respect to regions where (large size) dust-aerosol dominates. The most promising approach for aerosol retrievals over land involves ultraviolet measurements, not by itself, but in combination with other spectral data ranging from the visible to the far-infrared. These measurements have to come from the same instrument or at least the same satellite, if improvements to retrievals on aerosol properties can be expected.

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