[Measuring the spread of airborne microorganisms in the area of composting sites]

Emission concentrations of culturable microorganisms were determined in the vicinity of three open or partly encapsulated composting facilities. Sampling was performed during so-called worst case situations which should promote aerial transport of emissions. Suitability of thermophilic organisms to detect an emitting influence of the plant was confirmed. Generally, concentrations decreased significantly with increasing distances from the plant at all three locations. At one plant 10(6) CFU m-3 thermophilic actinomycetes were found in a distance of 200 m. Partly increased concentrations could be determined even in distances above 500 m. Concentrations could vary within one hour to more than ten times.