ISO 18593 is an international standard for "Cleanrooms and associated controlled environments - Part 1: Vocabulary" and also provides guidance on the measurement of airborne particle concentration in cleanrooms and clean zones.
: If you're interested in learning more about cleanrooms and controlled environments, I can recommend checking out the ISO website for related standards and resources. iso 18593 download
If you're looking to download ISO 18593, I can guide you through the process. ISO 18593 is an international standard for "Cleanrooms