Air Quality and Human Health Risk Assessment in the Residential Areas at the Proximity of the Nkolfoulou Landfill in Yaoundé Metropolis, Cameroon
Table 4
Concentration of odorous gases at the monitoring sites (n1 = 12; n2 = 192).
Site code
CH2O (μg/m3)
H2S (μg/m3)
SO2 (μg/m3)
Range of hourly mean
Daily mean
Range of hourly mean
Daily mean
Range of hourly mean
Daily mean
Min
Max
Min
Max
Min
Max
RA0
ND
ND
NC
ND
ND
NC
ND
1.74
0.82
RA1
ND
185.56
32.25
ND
152.97
20.45
ND
14.28
2.14
RA2
ND
133.95
24.88
ND
139.06
19.60
ND
26.18
3.56
RA3
ND
130.32
22.02
ND
122.49
11.02
ND
28.56
4.18
RA4
ND
172.20
25.71
ND
166.87
22.45
ND
11.90
2.28
RA5
ND
138.62
14.49
ND
62.97
8.74
ND
6.80
1.30
RA6
ND
206.76
30.83
ND
236.40
28.06
ND
16.66
1.70
RA7
ND
147.15
28.13
ND
194.68
25.13
ND
12.14
1.90
RA8
ND
181.10
27.79
ND
180.78
24.02
ND
11.05
1.45
RA9
ND
149.08
21.65
ND
139.06
20.25
ND
4.92
1.05
RA10
ND
142.03
17.59
ND
125.15
17.53
ND
5.35
1.18
RA = residential area; ND = not detected; NC = not calculated because not detected; n1 = number of measurements per hour; n2 = number of measurements per day (24 hours).
