Abstract
A comparative account of Alternaria and Cladosporium spore concentrations in four cities in the European Economic Community (EEC), is given for the years 1973 and 1974. Sijilar volumetric air sampling methods were employed in each of the cities, and concentrations of 3000 Cladosporium spores and 100 Alternaria spores/m3 were taken as the threshold concentrations for clinical significance. With Cladosporium, although highest concentrations were observed in Brussels, the differences were less marked at the other stations. Highest Alternaria concentrations were reocrded in Brussels, followed by London, Leiden and Munich. During the 2 years studied, the average number of days with spore concentrations greater than the threshold value for Cladosporium were 59 in Brussels, 36 in Leiden, 38 in London and 46 in Munich and for Alternaria, 48 in Brussels, 13 in Leiden, 33 in London and 5 in Munich.
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