Cent Eur J Public Health 1998, 6(1):25-28

Air-borne microorganisms in the metropolitan area of Graz, Austria

Köck M.¹, Schlacher R.¹, Pichler-Semmelrock F.P.¹, Reinthaler F.F.², Eibel U.², Marth E.², Friedl H.³

¹ Office for Information of Environment Protection Institute of Hygiene, University of Graz, Austria

² Institute of Hygiene, University of Graz, Austria

³ Institute of Statistics, Technical University of Graz, Austria

Urban and rural regions are affected by different microorganism loads depending on their structure and utilization. At 7 sampling sites in the metropolitan area of Graz, counts of airborne bacteria as well as yeasts and molds were conducted over a one-year period at two-week intervals. Bacteria and yeasts/molds counts in a village area to the South of Graz dominated by agriculture exceeded the corresponding counts in a suburban residential area fourfold (327 CFU/m³ air-bacteria) and twofold (185 CFU/m³ air-yeasts/molds) respectively. In the vicinity of a composting facility located in the same residential area, microorganism counts exceeded those of the neighboring "unaffected" area by 29 % in the case of bacteria and by 54 % in the case of yeasts/molds. At an industrial and business site with heavy traffic, the counts are twice that of the area affected by the composting facility (146 CFU/m³ for bacteria and 168 CFU/m³ for yeasts/molds). The proportion of Aspergillus fumigatus is highest in the village area with 23 %, compared to 10 % in the open land. 49 % of the bacteria and 54 % of the yeasts and molds can be shown on stages 4-6 of the Andersen-Volumetric-Sampler registering the respirable particle sizes.

Published: February 1, 1998  Show citation