| http://www.w3.org/ns/prov#value | - Biological agents, such as bacteria or viruses, are particles and can be filtered by particulate filters with the same efficiency as non-biological particles having the same physical characteristics (size, shape, etc.) However, unlike most industrial particles there are no exposure limits, such as Permissible Exposure Limits (PELs) or Threshold Limit Values (TLVs) established for biological agents
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