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78032 
Technical Report 
Workplace atmospheres-size fraction definitions for measurement of airborne particles 
European Committee for Standardization :: CEN 
1993 
European Committee for Standardization (CEN), British Standards Institute 
London, England 
BS EN 481:1993 
NAAQS
• ISA-PM (2019)
     Peer Input Draft
          Chapter 4
     1st Draft
          Chapter 4
     Final ISA
          Chapter 4