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Table 9 Air pollution tolerance index (APTI) and classification for selected tree species in the Kumasi Metropolis

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

Tree species Ascorbic acid (mg/g) Total chlorophyll (mg/g) pH Relative water content (%) APTI Classification
Thakar and Mishra’s approach Padmavathi’s approach
Control site
Terminalia catappa 12.05 1.21 6.15 68.17 15.69 Sensitive Intermediate
Mangiferaindica 14.38 1.53 6.11 64.42 17.43 Intermediate Tolerant
Ficusplatyphylla 13.46 1.52 6.13 77.84 18.08 Intermediate Tolerant
Polyalthialongifolia 10.91 1.41 6.75 79.94 16.89 Sensitive Intermediate
Arterial road I
Terminalia catappa 19.81 0.53 5.48 86.11 20.52 Tolerant Tolerant
Mangifera indica 18.53 0.67 5.08 80.08 18.66 Moderately tolerant Tolerant
Ficus platyphylla 15.97 0.97 5.73 85.42 19.24 Moderately tolerant Tolerant
Polyalthia longifolia 13.61 0.93 5.73 85.97 17.66 Intermediate Tolerant
Arterial road II
Terminalia catappa 19.68 0.84 5.09 83.8 20.05 Tolerant Tolerant
Mangiferaindica 17.18 1.01 5.60 68.39 18.19 Intermediate Tolerant
Ficusplatyphylla 18.92 0.65 5.13 82.75 19.21 Moderately tolerant Tolerant
Polyalthialongifolia 12.09 0.58 5.85 84.49 16.22 Sensitive Intermediate
Arterial road III
Terminalia catappa 15.41 1.02 5.10 92.81 18.71 Moderately tolerant Tolerant
Mangiferaindica 16.86 1.13 5.47 83.63 19.49 Moderately tolerant Tolerant
Ficusplatyphylla 16.03 0.70 5.42 92.19 19.02 Moderately tolerant Tolerant
Polyalthialongifolia 14.32 0.74 5.92 93.86 18.92 Moderately tolerant Tolerant