[Dust and microorganism count at delivery, sorting and composting of home refuse and home refuse-like industrial waste].

The exposure of employees to airborne dust and microorganisms was assessed in a waste processing plant established to recover reusable materials from unsorted domestic and industrial waste. Exposure criteria considered relevant were the quantity of the individual size-selected particle fractions, the morphological properties of the particles, their heavy metal content, and the degree of their contamination with various microorganisms and mold. In addition, separate microbiological analyses to determine potential pathogen concentrations in the air were made.

[Effect of ozone on airborne microorganisms].

The microbicidal effect of ozone in air was tested at concentrations between 50 and 600 micrograms/m3 against the species: Staphylococcus epidermidis, Micrococcus luteus, Arthrobacter citreus, Bacillus subtilis (veg.), Escherichia coli, Salmonella typhimurium, Serratia marcescens, Pseudomonas fluorescens and Candida albicans. The microorganisms were exposed on membrane filters at 60-75% relative humidity and 21.

[Illnesses in relation to swimming pool visits--conclusions of a survey].

Diseases acquired by using swimming-pools were recorded by inquiring visitors and local physicians in a German spa. The diseases were brought into relation with microbiological and chemical parameters of the swimming-pool water. Water quality was in general satisfying, but on days with a very great number of visitors the treatment-plant quickly was working beyond capacity.