This page has loads of stuff on EU and FDA definitions for particulate and microbiological conditions, ISO standards etc.

http://www.s2c2.co.uk/docs/ClassificationOfCleanrooms2005.ht...

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Note added at 5 hrs (2006-07-19 20:49:35 GMT)
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The title "Contrôle de l’environnement particulaire et micro-biologique" is tricky, as without more context it's hard to know whether it refers to testing the levels/maintaining acceptable levels (probably both). I'd be tempted to use something like "Particulate and microbiological cleanliness", a formula that comes up quite a bit on that link and others, and leave the specifics of what his "contrôle" entails to the content of the section.

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Note added at 14 hrs (2006-07-20 06:34:46 GMT)
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Another suggestion for the title would be "Ensuring airborne particulate and microbiological cleanliness"

eg
http://www.particle.com/whitepapers_met/Cleanroom Standards....

Federal Standard 209E has long been the only definition of cleanroom classification levels available from a standards organization. FS209E, Airborne Particulate Cleanliness Classes in Clean Rooms and Clean Zones, is from the U.S. General Service Administration and approved for use by all U.S. agencies. In the absence of an international standard, FS 209E was broadly used internationally.