Application of the Simple Additive Weighting Method in the Assessment Process of Air Pollution on the Campus of the Silesian University of Technology

Figure 1.

Compilation of the concentration of PM10 [μg/m3] and PM2_5 [μg/m3] and the content of SO2 [μg/m3], NO [μg/m3], NO2 [μg/m3] and NOx [μg/m3] in the “winter period” of the year 2020

Measurement date	PM10 [μg/m3]	PM2.5 [μg/m3]	SO2 [μg/m3]	NO [μg/m3]	NO2 [μg/m3]	NOX [μg/m3]
1/01/2020	40.462	28.323	25.478	3.275	8.706	13.715
2/01/2020	124.902	87.432	41.503	38.821	27.195	86.583
3/01/2020	107.254	75.078	32.006	26.421	14.956	55.371
…	…	…	…	…	…	…
29/03/2020	55.676	38.973	7.273	2.754	14.338	18.552
30/03/2020	20.938	14.656	6.421	3.986	15.239	21.336
31/03/2020	39.466	27.626	8.923	5.641	20.317	28.951
1/10/2020	18.258	12.781	22.049	14.453	19.972	42.070
2/10/2020	26.515	18.560	21.959	9.113	21.565	35.493
3/10/2020	24.387	17.071	22.209	1.164	7.612	9.392
…	…	…	…	…	…	…
29/12/2020	43.747	30.623	19.279	13.790	24.309	45.409
30/12/2020	39.855	27.899	18.920	41.474	45.820	109.232
31/12/2020	54.991	38.493	37.079	13.620	34.108	54.943

Scaled decision matrix V

Measurement date	j = 1	j = 2	j = 3	j = 4	j = 5	j = 6
1/01/2020	0.802	0.802	0.446	0.979	0.931	0.970
2/01/2020	0.295	0.295	0.000	0.661	0.467	0.621
3/01/2020	0.401	0.401	0.264	0.772	0.774	0.770
…	…	…	…	…	…	…
29/03/2020	0.710	0.710	0.952	0.984	0.789	0.947
30/03/2020	0.919	0.919	0.976	0.973	0.767	0.933
31/03/2020	0.808	0.808	0.906	0.958	0.639	0.897
1/10/2020	0.935	0.935	0.541	0.879	0.648	0.834
2/10/2020	0.885	0.885	0.544	0.927	0.608	0.866
3/10/2020	0.898	0.898	0.537	0.998	0.958	0.990
…	…	…	…	…	…	…
29/12/2020	0.782	0.782	0.618	0.885	0.539	0.818
30/12/2020	0.805	0.805	0.628	0.637	0.000	0.513
31/12/2020	0.715	0.715	0.123	0.887	0.294	0.773

Partial rankings of “objects” in terms of measurement results of the concentrations of chemical compounds: SO2, NO, NO2 and NOx

Place in ranking	“Object”	Concentration of dust PM10	Place in ranking	„Object”	Concentration of dust PM2.5
1	21/03/2020	5.552	1	22/11/2020	0.959
2	22/03/2020	5.876	2	26/12/2020	1.051
3	18/02/2020	5.926	3	03/10/2020	1.164
4	12/03/2020	6.141	4	25/12/2020	1.351
…	…	…	…	…	…
166	31/12/2020	37.079	166	09/11/2020	64.873
167	14/01/2020	38.031	167	16/01/2020	96.890
168	02/01/2020	41.503	168	17/01/2020	112.511
Place in ranking	“Object”	Concentration of NO2	Place in ranking	“Object”	Concentration of NOx
1	22/11/2020	5.935	1	22/11/2020	7.406
2	18/10/2020	6.790	2	25/12/2020	9.094
3	25/12/2020	7.028	3	18/10/2020	9.249
4	03/10/2020	7.612	4	03/10/2020	9.392
…	…	…	…	…	…
166	27/03/2020	42.210	166	05/03/2020	129.471
167	17/01/2020	44.248	167	16/01/2020	183.417
168	30/12/2020	45.820	168	17/01/2020	216.371

Ranking vector R [m×1]

“Object”	Rank (synthetic value)	Ranking place
22/11/2020	0.976	1
25/12/2020	0.964	2
22/03/2020	0.956	3
11/02/2020	0.952	4
12/02/2020	0.945	5
02/02/2020	0.944	6
21/03/2020	0.941	7
12/03/2020	0.940	8
11/03/2020	0.938	9
18/10/2020	0.934	10
…	…	…
03/12/2020	0.586	159
18/03/2020	0.578	160
01/12/2020	0.573	161
11/12/2020	0.509	162
02/12/2020	0.455	163
02/01/2020	0.437	164
05/03/2020	0.433	165
09/11/2020	0.409	166
16/01/2020	0.300	167
17/01/2020	0.064	168

Weights of features (parameters) wj used in the example

wj
j = 1	j = 2	j = 3	j = 4	j = 5	j = 6
0.163	0.163	0.121	0.286	0.095	0.173

Partial rankings of “objects” in terms of measurement results of the concentrations of dusts: PM10 and PM2_5

Place in ranking	„Object”	Concentration of dust PM10	Place in ranking	„Object”	Concentration of dust PM2.5
1	14/10/2020	7.403	1	14/10/2020	5.182
2	23/02/2020	10.552	2	23/02/2020	7.386
3	11/03/2020	11.191	3	11/03/2020	7.834
4	12/03/2020	11.752	4	12/03/2020	8.226
…	…	…	…	…	…
166	16/01/2020	113.446	166	16/01/2020	79.413
167	02/01/2020	124.902	167	02/01/2020	87.432
168	17/01/2020	174.146	168	17/01/2020	121.902

Measured values of air temperature, air humidity and air pressure, wind speed and direction

Measurement date	Air temperature [°C]	Air humidity [%]	Air pressure [hPa]	Wind speed [m/s]	Wind direction [°]
1/01/2020	2.626	77.801	1005.725	1.203	208.410
2/01/2020	−0.240	74.948	1003.083	0.514	151.699
3/01/2020	0.998	73.279	996.589	0.954	128.822
…	…	…	…	…	…
29/03/2020	4.583	72.266	988.835	3.349	340.415
30/03/2020	0.262	59.337	996.989	2.493	270.373
31/03/2020	0.566	65.272	999.125	1.642	272.971
1/10/2020	12.491	95.095	979.778	0.995	89.145
2/10/2020	14.304	86.464	979.089	0.946	173.747
3/10/2020	19.404	65.669	975.675	2.524	179.362
…	…	…	…	…	…
29/12/2020	4.897	78.060	968.197	1.015	148.936
30/12/2020	3.773	92.317	978.256	0.646	193.396
31/12/2020	−0.311	97.963	983.239	1.055	171.390

The ranges of variability of the measured parameters

Measurement date	PM10 [μg/m3]	PM2.5 [μg/m3]	SO2 [μg/m3]	NO [μg/m3]	NO2 [μg/m3]	NOX [μg/m3]
max	174.146	121.902	41.503	112.511	45.820	216.371
min	7.403	5.182	5.552	0.959	5.935	7.406