Abstract: The present invention creates an apparatus for determining physical collective parameters of particles in gases, which comprises a measuring chamber with light entrance ports (121) and exit ports (123, 124) for electromagnetic radiation, an emission source (113) for electromagnetic radiation being provided and at least two detection apparatuses (114, 115) for determining the intensity of electromagnetic radiation scattered at the particles being provided, and the detection apparatuses (114, 115) detecting electromagnetic radiation of different scattering regions. The present invention further creates a method for determining physical collective parameters of particles in gases, the particles being exposed to electromagnetic radiation which is scattered at the particles, wherein the intensities of the scattered radiation of at least two different scattering regions are determined and their ratio is taken subsequently.

Abstract: The invention relates to methods for removing gaseous contaminants and aerosols from a vapor-saturated gas stream, in which method a gas stream containing a) at least one gaseous contaminant which is soluble in a scrubbing liquid, with or without salt formation, and b) at least one aerosol with a particle size from 0.01 to 10 &mgr;m, is brought into contact, in a scrubber column, with a scrubbing liquid, the temperature of which is lower by at least 2° C. than the temperature of the gas stream, resulting in the formation of a vapor phase, the degree of saturation S of which is greater than 1, and in the removal of the gaseous and particulate contaminants from the gas stream.