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 |