*3.2. Analysis of Particulate Mass (PM) Distribution in Wroclaw and Cracow*

The next stage of the analysis was particulate mass (PM) distribution in Wroclaw and Cracow. Figure 3 presents mass distribution of particulate matter in measurement points in the Wroclaw and Cracow areas. The results obtained are presented in the form of characteristics of the particles mass concentration as a function of their diameter (dM/dlogDp). This analysis showed that particulate matter occurred throughout the whole measurement range, i.e., 0.34–10.00 μm.

**Figure 3.** Particulate mass (PM) distribution in Wroclaw and Cracow.

A more detailed description is provided in Figure 4 which shows the share percentage of each particle diameter in the test in each type of immission source. The green color indicates the shares up to 5%, yellow the range between 5% and 50%. Additionally, the range of the diameter of the largest particles number, and the share of particles with a diameter smaller than 1 μm are shown in Table 2.


**Figure 4.** Percentage of particulate matter by their size in tests (all sectors).


**Table 2.** Detailed results of PM distribution in Wroclaw and Cracow.
