This dust monitor has many functions. With the dust monitor it is possible to determine the number of particles in the size of 0.3, 2.5 and 10 µm. In addition to measuring the particles, the dust monitor can also measure the PM 2.5 and PM 10 mass concentration. The mass concentration of the dust monitor determines the weight of the particles on one cubic meter. In addition to particle measurement, the dust monitor can also determine the formaldehyde content in ppm. During this HCHO measurement, the temperature, the ambient humidity and the dew point are determined and displayed by the dust monitor. As a further important property, the dust monitor can also store data. It is therefore possible with the dust monitor to evaluate all measured values after a measurement.