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Conclusions

The Brewer MKII measurements have been made in the narrow band of the UV-B radiation, and the aerosol optical thicknesses have been obtained from the Langley method for a biomass burning site. Values have shown large variability along the campaign, varying from 0.1 to 3.5 at 306.3 nm. Large uncertainties seem to be often associated to large aerosol optical thickness, or a strongly polluted day. The sulfur dioxide optical thickness was much smaller than that of ozone at that rural site.