# Odor Impact Assessment via Dispersion Model: Comparison of Different Input Meteorological Datasets
## 3 Results and Discussion
### Contour Maps  
Figures 4 and 5 show the simulated contour maps for the point source and the area source, respectively. In each of these graphs, the CALPUFF results on the Italian domain (top) and Cuban one (bottom) are compared by setting the three different CALMET input meteorological settings: from the left to the right, \"NO-OBS\", \"OBS\", and \"HYBRID\" simulations are reported. In addition, in the Supplementary Material, the odor concentration values (98 th percentile on an annual basis) of discrete receptors are reported (Tables S1-S4). According to the Italian Lombardy Region Guideline for odor [33], odor impact maps should incorporate three reference odor concentration values in \(\text{ou}_{\text{E}}\) (European odor unit): \(1\,\text{ou}_{\text{E}}/\text{m}^{3}\), \(3\,\text{ou}_{\text{E}}/\text{m}^{3}\), and \(5\,\text{ou}_{\text{E}}/\text{m}^{3}\). These values correspond to:  
* At \(5\,\text{ou}_{\text{E}}/\text{m}^{3}\), \(90\text{--}95\%\) of the population perceives the odor. * At \(3\,\text{ou}_{\text{E}}/\text{m}^{3}\), \(85\%\) of the population perceives the odor. * At \(1\,\text{ou}_{\text{E}}/\text{m}^{3}\), \(50\%\) of the population perceives the odor. The aforementioned guideline mandates the computation of the 98 th percentile of odor peak concentration values on an annual basis. Despite the absence of a universal approach for defining short-term peak concentration, a constant factor of 2.3 is suggested [33]. Due to the lack of a technical standard for odor in Cuba, the aforementioned criterion has been considered in the current study for both the Cuban and Italian domains. Figure 4: Contour maps for the point source site for all the simulations, highlighting the distances (m) from the emissions source. The (**upper**) maps show the Italian domain, while the (**lower**) maps consider the Cuban one. Looking at the simulated contour maps for the point source (Figure 4), it is evident that, in the Italian site, the major impact is observed along the east (E) and west (W) directions, consistent with the prevailing wind directions shown in Figure 3.  
Similarly, in the Cuban domain, the contour maps still exhibit odor impact coherent with the most frequently observed wind direction, i.e., southwest (SW). In the Italian domain, the contour line corresponding to 5 ou\({}_{\rm E}\)/m\({}^{3}\) reaches a maximum distance of about 100 m along the prevailing wind directions (E and W). For 3 ou\({}_{\rm E}\)/m\({}^{3}\), the lines extend from 100 m to 200 m. Considering the distance related to 1 o\({}_{\rm E}\)/m\({}^{3}\), the maximum value is 400 m in the main wind directions (E and W). In the Cuban domain, the contour lines for 5 o\({}_{\rm E}\)/m\({}^{3}\), 3 o\({}_{\rm E}\)/m\({}^{3}\), and 1 o\({}_{\rm E}\)/m\({}^{3}\) reach about 150 m, 300 m, and 600 m, respectively, along the prevailing wind direction (SW). The most interesting outcome from this investigation is that in both domains, the \"NO-OBS\", \"OBS\", and \"HYBRID\" simulations are comparable in terms of odor impact. Concerning the area source impact maps (Figure 5), in the Italian domain, the contour line corresponding to 5 o\({}_{\rm E}\)/m\({}^{3}\) reaches a maximum distance of about 150 m for \"NO-OBS\" simulations and 250 m for the \"OBS\" and \"HYBRID\" modes in the main east direction. For 3 o\({}_{\rm E}\)/m\({}^{3}\), the maximum distance is about 300 m for \"NO-OBS\" and 350 m for \"OBS\" and \"HYBRID\". Finally, considering the reference value of 1 o\({}_{\rm E}\)/m\({}^{3}\), the line achieves a maximum distance of 500 m and 800 m for \"NO-OBS\" and \"OBS\"/\"HYBRID\", respectively. In the Cuban domain, the line corresponding to 5 o\({}_{\rm E}\)/m\({}^{3}\) reaches a distance of 150 m for \"NO-OBS\" and 200 m for the \"OBS\" and \"HYBRID\" mode. The distance for 3 o\({}_{\rm E}\)/m\({}^{3}\) reaches 200 m for \"NO-OBS\" and 300 m in the other cases in the main SW direction.