Utah County Emissions Practice Test 2025 - Free Emissions Practice Questions and Study Guide

A non-continuous monitor refers to a type of monitoring system that activates during specific events or conditions rather than continuously. In this context, the correct choice indicates that the monitor runs only once during an individual trip. This intermittent operation allows for data to be collected at critical times, rather than throughout the entire duration of the driving period. Such monitors can be particularly useful for assessing emissions during specific phases of driving—like acceleration or cruising—where emissions may vary significantly, rather than providing a continuous readout that might not capture these critical moments as effectively.

In contrast, other options imply continuous operation or lack of monitoring, which does not align with the definition of a non-continuous monitor. Continuous monitors would run at all times while in use, and a monitor that is not used at all would not provide any data, negating its purpose. Therefore, recognizing that non-continuous monitors are designed for targeted data collection is essential in understanding their role in emissions monitoring systems.