Summary
The purpose of a series of studies beginning with this paper is to clarify and to improve the qualitative environment of air conditions in the agricultural structures. In this paper, the authors examined the concentration of airborne dust and airborne microbes in dairy barns. As a result of measured data, it is considered that the concentration of airborne microbes in dairy barns were prescribed with various environmental factors. The concentration of airborne dust were below 0.2 mg/m3. and the airborne microbes were counted from 1 to 200 GEP/l. It was concluded that common (viable) bacteria were more suitable than true fungi or Escherichia coli as an index of the microbial counts in the dairy barns. The number of the microbes which attached to respirable dust was estimated 5.0 x 104 - 2.2 x 107 CFP/mg.HomePage