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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 sitesCO (ppm)SO2 (ppm)NO2 (ppm)VOC (ppm)
Arterial road I7.96 ± 1.62b0.15 ± 0.01b0.08 ± 0.00a0.12 ± 0.29a
Arterial road II6.81 ± 0.16b0.21 ± 0.02b0.08 ± 0.01a0.07 ± 0.02a
Arterial road III5.26 ± 0.06b0.21 ± 0.01b0.10 ± 0.00a0.08 ± 0.00a
Control site0.85 ± 0.24a0.07 ± 0.02a0.06 ± 0.01a0.01 ± 0.00a
  1. Mean + SE in the same column with different letters in superscript are significantly different (P < 0.05)