The basic idea of the research presented in this thesis is the design of a device that could be used to perform interlaboratory comparative measurements of the concentration of solid particles in the waste air from stationary sources. In the conditions of rapid growth of the world's population and accelerated economic development, the components of the environment are increasingly burdened by various emissions, and the consequences are also felt at the global level. Awareness of the need to preserve the environment and public pressure on legislators to do something about it is growing at the same rate. The legal framework prescribing the methods and frequency of emission measurements is becoming clearer, and emission limit values are becoming stricter. It is similar with the emissions of solid particles into the waste air from stationary sources, which is what this paper deals with. The device for measuring the gas velocity, volume flowrate of gas streams in ducts and mass concentration of solid particles in the waste air for interlaboratory comparative measurements in compliance with the standards ISO 10780, ISO 9096 and ISO EN 13284-1 was envisaged and constructed and three series of measurements were performed. In the first series, an initial set of measurements was performed and all statistical parameters needed to define the reference material or – in this case – the reference sample on the reference system were calculated. It has been proven that the sample sites are properly selected and that the measured values of differential pressure, static pressure, temperature and gas flow rate are homogeneous. Therefore, they can be used to calculate the reference gas flow rate. The reference gas flow rate was shown to be Xv,ref = 12.56±0.39 m/s at 102100 Pa and 25 °C. The reference value of the concentration of solid particles is Xp,ref = 15.30±0.47 mg/m^3 at 101200 Pa and 5 ° C. The reference values depend on the actual values of the atmospheric parameters at the time of measurement and (for the concentration of solid particles) on the actual mass of the dosed solid particles. The second set of measurements was performed by five independent laboratories. The reference values in this measurement were Xv,ref = 12.56 ± 0.39 m/s for the gas flow rate and Xp,ref = 16.08 ± 0.50 mg/m^3 for the concentration of solid particles. From these five laboratories, four were able to present meaningful results that could be used to determine the value of the standard deviation of the interlaboratory comparison, σmlab. The values of standard deviations of the interlaboratory comparison 0.48 m/s for the gas flow rate and 1.12 mg/m^3 for the concentration of solid particles in the waste air were determined. The third series of measurements was conducted by four independent laboratories accredited to measure emissions of air pollutants from stationary sources and the results were used to evaluate their achievements. In most cases, the laboratories showed satisfactory performance. Only in one case was a "signal requiring action" detected when the laboratory did not successfully measure the gas flow rate. The results confirmed the basic idea of the whole project.