Table 1: Seasonal distribution of air quality in some Municipal Solid Waste Dumpsites of Yenagoa Metropolis.
| Dry Season | Wet Season | ||||||||||
| CO (ppm) | SOX (ppm) | NOX (ppm) | H2S (ppm) | NH4 (ppm) | CH4 (ppm) | CO (ppm) | SOX (ppm) | NOX (ppm) | H2S (ppm) | ||
| Eliozo/Eligbolo and Obigbo In Port Harcourt, River state | - | 0.22-0.23 | 0-05 (for NO2) & 0.2-5.2 (for NO) | 0.06-0.08 | 0.3-3 | 36 - 53 | - | - | - | - | Ezekwe and Arokoyu [98] |
| Rumuolumeni, Port Harcourt, River state | - | 0.026-1.677 mg/m3 for SO2 | 0.1-0.39 mg/m3 for NO2 | 0.084-0.404 mg/m3 | 0-0.300 mg/m3 | 0.007-0.138 | - | - | - | - | Weli and Adekunle [99] |
| Yenagoa metropolis | 0.02 -1.18 | 0.01-0.81 | 0.01-0.82 | 0.20-6.95 | - | - | 0.01-0.54 | 0.01-0.81 | 0.01-0.33 | 0.07 -7.44 | Angaye, et al. [53] |
| Control | 0.02 | 0.01 | 0.01 | 0.01 | - | - | 0.01 | 0.01 | 0.01 | 0.01 | |
| WHO Limits | 30 | 0.07 | 0.12 | 0.07 | - | - | 30 | 0.07 | 0.12 | 0.07 | |
| NAQS | 10 | 0.01 | 0.04-0.06 | - | - | - | 10 | 0.01 | 0.04-0.06 | - | |
The season of Ezekwe and Arokoyu study was not mentioned [98]; Weli and Adekunle Studies was carried out in December (dry season) [99].