With the increasingly high requirements of environmental governance in China, PM2.5 has become an important indicator of environmental monitoring, ａnd dust in the air, as an important part of PM2.5 indicators, has also become the object of monitoring by environmental protection departments at all levels. At present, the main means of dust detection is manual sampling ａnd analysis, which is inefficient ａnd wastes a lot of human ａnd material resources. In order to improve the air quality, our company uses wireless sensor technology ａnd laser dust testing equipment to develop self-developed site dust monitoring instrument. In addition to dust monitoring, it can also monitor PM2.5, PM10, noise, ambient temperature, wind speed (other monitoring items can be added) ａnd other environmental factors. The test data of each test point is directly uploaded to the monitoring background through wireless communication, It greatly saves the monitoring cost of environmental protection department ａnd improves the monitoring efficiency.