Photoionization detectors (PIDs) are devices used to detect and measure the concentration of volatile organic compounds (VOCs) and other gases in the air. They work by using ultraviolet (UV) light to ionize gas molecules, creating charged particles that can be measured. This technology is commonly employed in environmental monitoring, industrial safety, and hazardous material detection. PIDs are valued for their sensitivity and quick response times, making them effective for identifying harmful substances. They are often portable, allowing for easy use in various settings, such as laboratories, factories, and outdoor environments. Their ability to detect low levels of contaminants helps ensure safety and compliance with environmental regulations.