Which is NOT a technique used for environmental monitoring? Response:

Question

Options

• ASettling plates
• BActive air sampling
• CEmployee opinion surveys
• DNonviable particle counting

• A
  13% (4)
• B
  3% (1)
• C
  78% (25)
• D
  6% (2)

Explanation

Employee opinion surveys (C) are a human resources tool used to gauge workplace satisfaction or culture - they have no role in environmental monitoring, which is concerned with detecting microbial or particulate contamination in controlled environments like cleanrooms or pharmaceutical facilities.

Settling plates (A) are passive air sampling devices - open Petri dishes placed in an environment to collect airborne microorganisms that fall onto the agar surface. Active air sampling (B) uses devices that draw a known volume of air through or over a collection medium to quantify viable airborne organisms. Nonviable particle counting (D) uses optical particle counters to measure the concentration of airborne particles regardless of whether they are alive, helping assess overall cleanliness classifications (e.g., ISO standards).

Memory tip: Think of environmental monitoring as anything that samples the environment itself - air, surfaces, and particles. If a technique involves people's thoughts or feelings rather than physical samples, it doesn't belong.

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