Atmospheric Volatile Organic Compounds and Ozone Creation Potential in an Urban Center of Southern Nigeria

Table 2

Composition and descriptive statistic of the observed VOCs.

VOC species	Mean ± SD	Morning	Afternoon	Evening
n-Butane	0.84 ± 0.01	0.79 ± 0.04	0.75 ± 0.16	0.98 ± 0.42
Isopentane	0.1 ± 0.01	0.1 ± 0.04	0.1 ± 0.02	0.1 ± 0.08
2-Methylpentane	0.95 ± 0.67	0.8 ± 0.07	0.98 ± 0.02	1.09 ± 0.08
3-Methylpentane	0.09 ± 0.33	0.1 ± 0.01	0.08 ± 0.02	0.1 ± 0.01
Undecane	0.54 ± 0.13	0.87 ± 0.08	0.62 ± 0.07	0.14 ± 0.01
Benzene	2.29 ± 1.07	2.03 ± 0.16	2.71 ± 0.19	2.15 ± 0.07
Toluene	5.82 ± 0.67	5.6 ± 0.96	5.87 ± 0.54	6.01 ± 1.03
Ethylbenzene	3.46 ± 1.33	3.84 ± 0.53	3.08 ± 0.05	3.47 ± 1.14
m,p-Xylene	3.58 ± 1.11	3.72 ± 1.03	3.81 ± 0.92	3.21 ± 0.79
o-Xylene	2.23 ± 0.33	2.24 ± 0.58	2.26 ± 0.14	2.2 ± 0.05
Naphthalene	0.88 ± 0.06	0.73 ± 0.11	1.03 ± 0.08	0.9 ± 0.04
Methylene chloride	0.79 ± 0.01	0.67 ± 0.02	1.02 ± 0.04	0.69 ± 0.02
Tetrachloroethane	0.96 ± 0.12	0.89 ± 0.06	0.97 ± 0.10	1.03 ± 0.08
Carbon tetrachloride	0.03 ± 0.01	0.04 ± 0.01	0.06 ± 0.02	0.01 ± 0.01
Chloroform	0.24 ± 0.03	0.28 ± 0.09	0.27 ± 0.04	0.18 ± 0.03
Acetone	0.92 ± 0.11	0.85 ± 0.16	1.02 ± 0.30	0.9 ± 0.12