Attempts to standardize passive air samplingUnfortunately, settle plates are used in very differentI don't like it. Dishes of different diameters, differentexposure times, different nutrient media and differ-ent incubation temperatureS and times, make itdifficult to compare data obtained by differentoperators.0 Moreover, a rating of the resultsobtained by settle plates has never been established.The first attempt to standardize the use of settleplates were made in the 1970s by Fisher. His studywas aimed at defining the best sampling parametersand methods.30, 56.68-70 Using Petri dishes 9 cm indiameter with blood agar, after 24h incubation at37°C and normalizing the results to cfu/dm* he wasable to show that air turbulence does not affect the
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