This is an online monitoring device based on "laser light scattering+pump suction constant current sampling", which can simultaneously provide the particle number concentration and mass concentration (PM2.5/PM10/TSP) of 12 channels in the particle size range of 0.3-20 μ m, helping users quickly identify the contribution ratios of different pollution sources such as urban dust, motor vehicle exhaust, and industrial combustion. It can superimpose meteorological five parameters (temperature, humidity, pressure, wind) or SO ₂, NO ₂, O3, CO, TVOC gas modules to achieve "integrated dust and gas" monitoring. Used for urban grid air micro stations; 24-hour online monitoring of dust on construction sites; Traceability of dust at the boundary of industrial parks; Atmospheric field observation in research institutes.