Formaldehyde (HCHO) is a colorless gas with a strong, pungent odor and is the most significant indoor air pollutant. It primarily originates from wood-based panels, furniture, and renovation materials; consequently, formaldehyde concentrations are often higher in newly renovated homes. High exposure poses serious health risks, potentially causing respiratory diseases, skin conditions, and neurasthenia.

A formaldehyde sensor is a device designed to detect and measure the concentration of HCHO in the air. There are two main working principles for formaldehyde sensors:

● Electrochemical Sensors: These are the most widely used formaldehyde sensors today, detecting HCHO levels through electrochemical reactions.

● Optical Sensors: Utilizing optical principles, these sensors offer advantages such as compact size, light weight, and rapid response times.

The application of formaldehyde sensors aids in monitoring indoor air quality, enabling timely detection of pollution and the implementation of air quality improvement measures. Their applications primarily include:

● IAQ Monitoring: Providing residents and occupants with real-time data regarding their environment.

● Formaldehyde Warning Systems: When HCHO concentrations reach a specific threshold, the sensor triggers an alarm to alert people.

● Formaldehyde Remediation: By measuring HCHO levels, these sensors help users choose the most effective remediation methods.

Using formaldehyde sensors is significantly important for improving indoor air quality and protecting public health.

The advantages of using formaldehyde sensors include:

● Real-time Monitoring: Providing accurate and continuous formaldehyde concentration data.

● Automatic Alarms: Instant notifications when air quality degrades beyond safety limits.

● Intelligent Control: The sensor can be integrated with air purifiers; when HCHO levels are high, the purifier can start automatically to clean the air.

In conclusion, the formaldehyde sensor is a vital tool for safeguarding IAQ. As technology advances, these sensors will become even more widespread, providing healthier and more comfortable living environments.