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(Airborne contaminant (Environmental sources: (worker activity, sink and…

- - - - Slit sampler
      - Sieve sampler
  - - - Easy to use
      - inexpensive
      - original state of particles
    - - no of viable particles per cubic unit of air
      - Weak correlation with other methods
      - Require long sampling time
      - Biased toward large particles
    - - Openings in equipment subjected to air currents
      - Selected point for testing general room air
      - Areas of employee concentration
      - Process air passage
    - - 15 min exposure of plates (90 mm diam) containing SPC agar
      - incubate and count
      - Microscope slide coated with agar and total particulate count under microscope