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Table 3 Ambient air quality of Kumasi Metropolis during the study period

From: Roadside air pollution in a tropical city: physiological and biochemical response from trees

Parameter/sampling sites CO (ppm) SO2 (ppm) NO2 (ppm) VOC (ppm)
Arterial road I 7.96 ± 1.62b 0.15 ± 0.01b 0.08 ± 0.00a 0.12 ± 0.29a
Arterial road II 6.81 ± 0.16b 0.21 ± 0.02b 0.08 ± 0.01a 0.07 ± 0.02a
Arterial road III 5.26 ± 0.06b 0.21 ± 0.01b 0.10 ± 0.00a 0.08 ± 0.00a
Control site 0.85 ± 0.24a 0.07 ± 0.02a 0.06 ± 0.01a 0.01 ± 0.00a
  1. Mean + SE in the same column with different letters in superscript are significantly different (P < 0.05)