Which is an accurate statement about using an air-monitoring device?

• A. They always work perfectly.
• B. They require no calibration.
• C. They never malfunction.
• D. If devices are used incorrectly, the safest of everyone around can be in jeopardy.

Answer: (D)

Air-monitoring devices are essential safety tools, but they’re not infallible. They rely on sensors that can drift, become fouled, or fail, and they need regular calibration, maintenance, and proper use to stay reliable. Operators must calibrate and bump-test devices, understand their limits and response times, and place monitors in representative breathing zones and areas of concern. If devices are used incorrectly—such as skipping calibration, ignoring alarms, misplacing the monitor, or using it beyond its rated conditions—the readings can be inaccurate or misleading, potentially leaving people exposed to hazards. That’s why the safest-in-general statement is that incorrect use of monitoring devices can jeopardize everyone’s safety.