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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 speciesAscorbic acid (mg/g)Total chlorophyll (mg/g)pHRelative water content (%)APTIClassification
Thakar and Mishra’s approachPadmavathi’s approach
Control site
Terminalia catappa12.051.216.1568.1715.69SensitiveIntermediate
Mangiferaindica14.381.536.1164.4217.43IntermediateTolerant
Ficusplatyphylla13.461.526.1377.8418.08IntermediateTolerant
Polyalthialongifolia10.911.416.7579.9416.89SensitiveIntermediate
Arterial road I
Terminalia catappa19.810.535.4886.1120.52TolerantTolerant
Mangifera indica18.530.675.0880.0818.66Moderately tolerantTolerant
Ficus platyphylla15.970.975.7385.4219.24Moderately tolerantTolerant
Polyalthia longifolia13.610.935.7385.9717.66IntermediateTolerant
Arterial road II
Terminalia catappa19.680.845.0983.820.05TolerantTolerant
Mangiferaindica17.181.015.6068.3918.19IntermediateTolerant
Ficusplatyphylla18.920.655.1382.7519.21Moderately tolerantTolerant
Polyalthialongifolia12.090.585.8584.4916.22SensitiveIntermediate
Arterial road III
Terminalia catappa15.411.025.1092.8118.71Moderately tolerantTolerant
Mangiferaindica16.861.135.4783.6319.49Moderately tolerantTolerant
Ficusplatyphylla16.030.705.4292.1919.02Moderately tolerantTolerant
Polyalthialongifolia14.320.745.9293.8618.92Moderately tolerantTolerant