The atmospheric environment monitoring plate of Expec Technology is composed of atmospheric photochemical pollution monitoring module, particulate pollution monitoring module and O3 and PM2.5 combined pollution monitoring module. It studies the real-time pollution situation, pollution sources, process analysis and formation mechanism, carries out the analysis of sources of atmospheric combined pollution, and forms a diversified and all-round 3D monitoring and early warning capability of regional atmospheric combined pollution, so as to realize the comprehensive monitoring of the formation mechanism and process of regional atmospheric combined pollution. It provides long-term basic data and decision-making support for managers to formulate precise control policies of atmospheric combined pollution, emergency response to heavy pollution, and evaluation of control effectiveness.