PM2.5 refers to particulate matter with a diameter equal to or less than 2.5 micrometers. Its hazards are significantly higher than other particles as it can penetrate the human respiratory tract and enter the lungs, causing serious health risks. Therefore, monitoring and controlling PM2.5 is a vital means of improving air quality and protecting public health.

A PM2.5 sensor is a device used to detect PM2.5 concentrations in the air. Its working principles mainly include:

● Optical Method: Measures PM2.5 concentration using scattered or absorbed light intensity.

● Electrochemical Method: Measures PM2.5 concentration using electrochemical reactions.

● Thermal Conductivity Method: Measures PM2.5 concentration based on changes in thermal conductivity.

PM2.5 sensors have a wide range of applications, including:

● Air Quality Monitoring: Essential for real-time monitoring to provide a scientific basis for government air management policies.

● Indoor Air Quality Monitoring: Used to monitor indoor environments, creating healthy and comfortable living spaces.

● Industrial Environmental Monitoring: Monitors emissions during production processes to help enterprises improve environments and reduce pollutants.

● Medical Health Monitoring: Monitors PM2.5 levels around patients to provide auxiliary diagnostic information for medical personnel.

● Traffic Environment Monitoring: Monitors concentrations in transit areas to assist in formulating traffic governance policies.

● Consumer Electronics: Integrated into smartphones and smart home devices to provide users with real-time air quality information.

With the continuous advancement of monitoring technology, the application fields of PM2.5 sensors will expand further, contributing significantly to cleaner air and human health.