The influence of photochemical pollution on the ultraviolet radiation reaching the ground is examined. For this purpose, a series of UY-A and UY-B measurements as well as the results of a simple parametric model are compared. It was found that the hypothesis of UY-B depletion is significant at an almost 95 per cent confidence level. It is also indicated that the effect of photochemical pollution on UY-B levels reaching the ground is roughly three times the same effect on UY-A levels.
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