Table 2.
Range and mean ± SD of pyrolysis and charcoal harvesting at settlements in Alabata, Ogun State
| Alabata (pyrolysis) | Alabata (harvesting) | ||||||
|---|---|---|---|---|---|---|---|
| Oluwotiti | Raka | Ikugba | Ayogun | Adaako | Raka | Fojubaye | |
| NO2 (ppm) mean ± SD | 0.25 ± 0.47 | 0.20 ± 0.27 | 0.19 ± 0.22 | 0.48 ± 0.71 | 0.018 ± 0.025 | 0.031 ± 0.058 | 0.08 ± 1.35 |
| SO2 (ppm) mean ± SD | 1.89 ± 2.77 | 1.74 ± 2.19 | 2.85 ± 1.83 | 2.93 ± 3.21 | 0.0075 ± 0.011 | 0.012 ± 0.016 | 0.02 ± 0.05 |
| CO (ppm) mean ± SD | 280 ± 149 | 96.8 ± 57.1 | 585 ± 163 | 2.93 ± 3.21 | 1.50 ± 2.05 | 14.65 ± 5.31 | 13.4 ± 6.46 |
| CO2 (ppm) mean ± SD | 1986 ± 1648 | 964 ± 819 | 3877 ± 2608 | 3021 ± 1958 | 221 ± 27 | 317 ± 147 | 714 ± 673 |
| PM2.5 (µg/m3) mean ± SD | 17,000 ± 270,000 | 6550 ± 7520 | 34,000 ± 17,000 | 18,000 ± 9000 | 430 ± 110 | 279 ± 230 | 103 ± 191 |