Air Quality and Human Health Risk Assessment in the Residential Areas at the Proximity of the Nkolfoulou Landfill in Yaoundé Metropolis, Cameroon

Table 6

Level of potential greenhouse gases at the monitoring sites (n₁ = 12; n₂ = 192).

Site code	CH4 (ppm)			CO2 (ppm)
	Range of hourly mean		Daily mean	Range of hourly mean		Daily mean
	Min	Max		Min	Max
RA0	ND	ND	NC	421.00	498.04	461.82
RA1	ND	0.06	0.03	450.25	503.12	481.64
RA2	ND	0.05	0.02	478.61	602.41	550.16
RA3	ND	0.03	0.01	490.25	649.27	573.02
RA4	ND	0.07	0.04	420.31	510.00	464.39
RA5	ND	0.04	0.01	425.50	503.74	466.41
RA6	ND	2.30	1.76	451.63	612.10	541.37
RA7	ND	0.18	0.08	428.50	505.31	467.32
RA8	ND	0.09	0.05	421.75	510.80	459.85
RA9	ND	0.07	0.04	401.60	507.28	469.63
RA10	ND	0.06	0.01	425.00	501.37	460.11

RA = residential area, ND = not detected, NC = not calculated because ND, n₁ = number of measurements per hour, n₂ = number of measurements per day (24 hours).