Cleanroom classification refers to a system of categorizing cleanrooms based on their level of cleanliness and the permissible amount of particulate and microbial contamination within the controlled environment. Cleanrooms are highly controlled environments used in various industries, such as pharmaceuticals, electronics, biotechnology, and healthcare, where a high level of cleanliness is required to ensure product quality, safety, and integrity. Cleanroom classification standards are typically defined and governed by international organizations, such as the International Organization for Standardization (ISO) and the U.S. Federal Standard 209E (FS 209E). However, it is important to note that the FS 209E standard has been officially replaced by the ISO 14644 series, which provides a globally accepted framework for cleanroom classification. The cleanroom classification system is primarily based on the measurement of airborne particles within a specified volume of air. The most commonly