There it was.
No. The 2022 amendment does not change your current ISO Class (e.g., Class 5 or Class 7). It simply adds a formal way to handle macroparticles . iso 14644-1 pdf 2022
To save you time reading the fine print, the following critical sections of the standard remain exactly the same as the 2015 version: There it was
So, before you download an outdated PDF from 1999 or 2015, let’s break down what this amendment actually changes—and what it leaves alone. It simply adds a formal way to handle macroparticles
Here is the truth: The core remains the active standard. However, in 2022 , the International Organization for Standardization (ISO) released a technical Amendment (Amd 1) .
If you are using the old 1999 or 2015 standards for 5 µm monitoring without the "M" descriptor, your classification could technically be considered non-compliant with the latest ISO guidelines. The 2022 update validates what many pharma cleanrooms were already doing—testing for large particles using specialized tools.
The 2015 version remains the global benchmark for classifying air cleanliness by particle concentration. It replaced the 1999 version with several critical updates: