Abstract: Method for removing all types of particulate matter with exclusion of biological multiplying microorganisms in indoor environments characterized by comprising the following two steps:—the atomization of compounds that oxidize particulate matter to form complexes and to precipitate them;—the atomization of a liquid containing a mixture of spores of Gram-positive aerobic and/or of facultative anaerobic spore formers to act as nuclei for extra precipitation, to cover the precipitated particulate matter; and to metabolize precipitated particles and to take up precipitated particles by the Gram-positive bacteria/thereby preventing the precipitated particles to become airborne again;—whereby the drop size in both atomization steps is held between 5 and 50 ?m to yield a dry nebula.

Abstract: Method for removing all types of particulate matter with exclusion of biological multiplying microorganisms in indoor environments characterized by comprising the following two steps:—the atomization of compounds that oxidize particulate matter to form complexes and to precipitate them;—the atomization of a liquid containing a mixture of spores of Gram-positive aerobic and/or of facultative anaerobic spore formers to act as nuclei for extra precipitation, to cover the precipitated particulate matter; and to metabolize precipitated particles and to take up precipitated particles by the Gram-positive bacteria/thereby preventing the precipitated particles to become airborne again;—whereby the drop size in both atomization steps is held between 5 and 50 ?m to yield a dry nebula.