Choose your answer before opening the explanation. This is a learning exercise, not a competency assessment.
You may end POPC when:
- Four days have passed
- The door smells sweet
- Ammonia at several points is below 10 ppm and temperatures are steady
- The fan ran all night
See the answer and why
Ammonia at several points is below 10 ppm and temperatures are steady DMR ties the end point to residual ammonia, not to elapsed time.

