Choose your answer before opening the explanation. This is a learning exercise, not a competency assessment.
A worker says the tunnel smells clean, so ammonia is below 10 ppm. This is:
- Correct, a clean smell proves it
- Wrong, the nose cannot read below 10 ppm
- Correct if he checked twice
- Correct only in winter
See the answer and why
Wrong, the nose cannot read below 10 ppm DMR says we generally cannot smell ammonia below 10 ppm, so a clean smell proves nothing.