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The absorption coefficient of the atmospheric aerosol average 20% light absorption and for the winter aerosol over Vienna has been determined by two independent with an average of 40% light absorption, they agree methods: the integrating plate method and by subtracting almost perfectly. When considering small corrections the light scattering coefficient obtained with an integratowing to truncation in the nephelometer, the light abing nephelometer from the light extinction coefficient sorption measured by the integrating plate is consistently obtained by telephotometer. The raw data are highly too high by 30%-40%. This is in agreement with previcorrelated and, both for the summer aerosol with an ously published results for other locations.

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