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Both hair (scalp) and beards pose major clean room contamination risks by shedding viable particles, skin flakes, and microorganisms. While facial hair generally traps more transient bacteria and sheds slightly more, studies on the Facial microbial flora in bearded versus nonbearded men (PMC) indicate that improper hygiene makes both sources equally hazardous.
Head hair and facial hair continually shed dead skin cells (squames) which carry bacteria.
Facial hair can shed thousands of particles per minute when moving. Beards can harbor higher localized microbial counts, but clean-shaven faces can shed similar or higher overall bacteria if micro-abrasions from shaving become colonized.
Facial hair breaks the seal of tight-fitting masks or respirators, allowing unfiltered air and skin particles to escape into the clean room.
To prevent contamination, facilities enforce strict Behavior in the Cleanroom ( Rodinger Kunststoff-Technik - rkt.de) guidelines depending on the Choosing the Right Cleanroom

Apparel for Contamination Control ISO classification:
Head Hair: Must be completely enclosed in an approved bouffant cap or cleanroom hood.

Beards/Mustaches: Must be fully covered using a Best practices for using a cleanroom beard cover - Lindström Group (snood) that fits snugly over the chin and jawline without any gaps.

Masks: Standard face masks should be worn in conjunction with beard covers to secure a proper seal and prevent oral/nasal shedding.

Hygiene: Regular washing and maintenance of both scalp and facial hair are required to reduce bioburden before donning cleanroom apparel