Which statement about air-monitoring device safety is true?

• A. They are foolproof.
• B. They must be calibrated only yearly.
• C. They may be unsafe if used incorrectly, jeopardizing safety.
• D. They never fail.

Answer: (C)

Air-monitoring devices are essential safety tools, but they’re not infallible. Their readings depend on proper use and regular maintenance. Sensors can drift over time, pumps or batteries can fail, and calibration or bump testing might be skipped or performed incorrectly. Environmental conditions, sensor poisoning, or exposure to gases outside what the sensor can detect can also distort readings. Because of these possibilities, the devices can be unsafe if used incorrectly, which is why a careless approach to calibration, testing, or interpretation can jeopardize safety. In short, these tools enhance safety when used correctly and maintained, but they do not guarantee safety on their own.