As the weather gradually gets colder, people tend to close doors and windows tightly while keeping warm, which can lead to a decrease in air quality. Especially in densely populated places such as schools, the air in classrooms is often very polluted, seriously affecting the healthy growth of students. With PM2.5 becoming a hot topic on the internet, the issue of air quality in classrooms has also become a focus of concern for parents.

Recently, education commissions in multiple provinces and cities have required schools and teachers to pay attention to classroom ventilation issues. Efforts should be made to open doors and windows during physical education classes and breaks to ensure the circulation of fresh air. Teachers and students should engage in outdoor activities during breaks and breaks, "said a person in charge of the Beijing Municipal Education Commission." Schools with conditions can install air quality detectors linked with fresh air fans that have ventilation and air exchange functions but will not affect classroom temperature. "In response to parents' calls to improve classroom air quality, some schools have quickly taken action by installing air quality detectors, temperature and humidity sensors, ventilation equipment, and even some schools have started installing air purifiers in classrooms. According to Chen Liexian, a researcher at the Chinese Center for Disease Control and Prevention, due to the uneven quality of various air purifier products on the market, many products have no effect on improving air quality after use. Some products also lose their air purification function after a period of use, and the air quality cannot be seen, touched or smelled. It is difficult for ordinary consumers to judge whether it has improved. As a result, many air purifiers have become self comforting decorations and have not played their due role. In addition, air quality is a dynamic indicator that needs to be continuously monitored. Different climate environments, population densities, and purification equipment can all lead to different air quality, which may be the reasons why air quality detectors are popular in schools.

From the perspective of the market situation, the most popular sensor currently is the IoT wireless air quality detector. This type of detector is not only easy to install and use, but also can start the exhaust fan for automatic ventilation in a timely manner when the air quality in the classroom decreases. More importantly, it can easily transmit the detected air indicators to the cloud for recording and analysis through wireless means. These data are of great significance to schools, education management departments, and social supervision. In addition, temperature and humidity, as an important indicator, have also been included in the monitoring range, and IoT wireless temperature and humidity sensors have become a standard configuration in many classrooms. In order to better serve students and reassure parents, some schools have stated that data on air quality, temperature and humidity in classrooms, dormitories, canteens, and even sports halls will be made public online at appropriate times, making it convenient for parents to check and supervise. They may even provide real-time air quality monitoring and reporting services when conditions are ripe. As more and more people care about the environment and health, we believe that the Internet of Things and cloud computing can have great potential in improving air quality.