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BS EN ISO 14644-1:2015 Cleanrooms and associated controlled environments. Classification of air cleanliness by particle concentration Status. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing. This is a list of International Organization for Standardization (ISO) standards. ISO 1–ISO 999 * ISO 1 Geometrical Product Specifications (GPS) — Standard.