Which of the following is NOT a type of environmental sensor?

The choice of a pressure sensor as the option that is NOT a type of environmental sensor is accurate because of the specific purpose and application of pressure sensors compared to the other options listed.

Environmental sensors are generally devices designed to detect specific environmental conditions that can be indicators of safety or security concerns. Gas detectors, carbon monoxide detectors, and water detectors are specifically tailored to monitor harmful substances or conditions in the environment.

Gas detectors are used to identify the presence of hazardous gases that can be dangerous to human health, and carbon monoxide detectors are critical for detecting carbon monoxide buildup, which is a colorless and odorless gas that can be fatal. Water detectors are utilized to sense the presence of water, which can indicate leaks or flooding, posing a risk to property and health.

On the other hand, pressure sensors typically measure pressure levels in various applications, such as monitoring gas or liquid pressures in mechanical systems. While they can be part of a broader environmental monitoring system, they do not exclusively monitor environmental hazards like the other types of sensors mentioned. Thus, pressure sensors do not fit the primary category of environmental sensors in the same way that gas detectors, carbon monoxide detectors, and water detectors do.