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Table 3 Concentration of gases and particulate matter from pyrolysis for settlements in Igboora, Oyo State

From: Air quality index from charcoal production sites, carboxyheamoglobin and lung function among occupationally exposed charcoal workers in South Western Nigeria

	Igbo-Ora (pyrolysis)				Igbo-Ora (harvesting)
	Igboyange	Apata	Irepodun	Iyana babanla	Igboyange	Apata	Irepodun	Iyana babanla
NO₂ (ppm) mean ± SD	1.30 ± 1.53	0.69 ± 0.74	1.67 ± 1.34	1.85 ± 1.53	0.097 ± 0.04	0.39 ± 0.40	0.35 ± 0.46	0.15 ± 0.14
SO₂ (ppm) mean ± SD	3.82 ± 2.48	0.87 ± 0.83	2.93 ± 3.06	0.80 ± 0.51	0.00	0.08 ± 0.21	0.04 ± 0.06	0.05 ± 0.12
CO (ppm) mean ± SD	691 ± 111	408 ± 116	959 ± 240	492 ± 202	1.83 ± 1.20	64.3 ± 67.5	32.7 ± 45.8	80 ± 102
CO₂ (ppm) mean ± SD	3281 ± 1952	2045 ± 132	2952 ± 1813	2863 ± 1547	236.89 ± 15.57	517 ± 169	584 ± 183	1222 ± 1355
PM_2.5 (µg/m³) mean ± SD	44,000 ± 17,000	50,600 ± 22,800	328,000 ± 87,000	70,400 ± 15,400	540 ± 210	450 ± 210	480 ± 220	540 ± 250

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