## 3 Results and Discussion
### Pollution Concentrations Counter Measurements Efficacy Analysis  
The main measures adopted in Italy to reduce pollutant concentrations are aimed at reducing the urban traffic with two types of strategy: rotation of cars on the streets based on the number of the plate and days of a total block of urban traffic. In fact, no policy strategy is made to reduce the utilization of heating systems. In order to verify the validity of the block of urban traffic, it was taken the data of pollutant concentration in 2015 when these measures were made. In particular, in 2015 they are:  
9 January 2015--Total block  
1 February 2015--Total block  
15 November 2015--Total block  
4/5 December 2015--Alternate plates  
6 December 2015--Total block  
13 December 2015--Total block  
17/18 December 2015--Alternate plates  
19/20 December 2015--Alternate plates  
21/22 December 2015--Alternate plates  
28/29 December 2015--Alternate plates  
31 December 2015--Total block  
Starting from the list above, it is useful to notice that the days in which the policy strategy was made are during the part of the year with the maximum pollutant levels. Chapter 3.3 has shown the fluctuation of the pollutant concentrations with the results of a high value during winter and especially from November to February. Usually, days with a total block of cars on the streets aren't applied after a day of rain. In Figures 5-15 the red band identifies the days of alternated plates, the green band identifies the total block of traffic, the blue line is the hourly pollutant concentration and the red dashed line is the daily mean pollutant concentration. In the charts are also shown the days with precipitation, expressed in mm. \begin{table} \begin{tabular}{c c c c c c c c c c c c c c c c c} \hline \hline
**Area** & \(\mathbf{[C_{6}H_{6}]}\) & \(\mathbf{[NO]}\) & \(\mathbf{[NO_{2}]}\) & \(\mathbf{[NO_{x}]}\) & \(\mathbf{[CO]}\) & \(\mathbf{[PM_{10}]}\) & \(\mathbf{[PM_{25}]}\) & \multicolumn{3}{c}{**Average**} \\ \cline{2-13}  & **UT** & **H** & **UT** & **H** & **UT** & **H** & **UT** & **H** & **UT** & **H** & **UT** & **H** & **UT** & **H** & **UT** & **H** \\ \hline Frosinone & 32 & 68 & 34 & 66 & 67 & 33 & 47 & 53 & 40 & 60 & 38 & 62 & 31 & 69 & 41.3 & 58.7 \\ Latina & 35 & 65 & 40 & 60 & 64 & 36 & 52 & 48 & 48 & 52 & 60 & 40 & 42 & 58 & 48.7 & 51.3 \\ Roma & 67 & 33 & 36 & 64 & 79 & 21 & 54 & 46 & 63 & 37 & 62 & 38 & 50 & 50 & 58.7 & 41.3 \\ Rieti & 24 & 76 & 26 & 74 & 56 & 44 & 45 & 55 & 36 & 64 & 57 & 43 & 39 & 61 & 40.4 & 59.6 \\ Viterbo & 60 & 40 & 36 & 64 & 68 & 32 & 56 & 44 & 78 & 22 & 66 & 34 & 62 & 38 & 60.9 & 39.1 \\ \hline Average & 43.6 & 56.4 & 34.4 & 65.6 & 66.8 & 33.2 & 50.8 & 49.2 & 53 & 47 & 56.6 & 43.4 & 44.8 & 55.2 & 50.0 & 50.0 \\ \hline \hline \end{tabular}   
Figure 4: Day variation of pollutant during 2015 considering the mean value hour per hour and divided from winter (blue line) to spring-autumn (red line). Figure 5: Pollutant concentration variation related to the total block of urban traffic of 9 th January 2015 (green band). The blue line is the hourly pollutant concentration. The Red dashed line is the daily mean pollutant concentration. Data of daily precipitation are indicated in mm. Figure 6: Pollutant concentration variation related to the total block of urban traffic of 1 st February 2015 (green band). The blue line is the hourly pollutant concentration. The Red dashed line is the daily mean pollutant concentration. Data of daily precipitation are indicated. Figure 7: Pollutant concentration variation related to the total block of urban traffic of 15 th November 2015 (green band). The blue line is the hourly pollutant concentration. The Red dashed line is the daily mean pollutant concentration. Data of daily precipitation are indicated in mm. Figure 8: Benzene concentration variation related to the total block of urban traffic (green band) and alternated plates (red band) of December 2015. The blue line is the hourly pollutant concentration. The red dashed line is the daily mean pollutant concentration.