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Table 11 Evaluation of tree species gradation based on APTI, morphological parameters and socio-economic importance

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

S/no Grading character Terminalia catappa Mangifera indica Ficus platyphylla Polyalthia longifolia
1 Air Pollution Tolerance Index 3 3 3 3
2 Type of plant 0 1 1 1
3 Plant size 1 1 1 1
4 Canopy structure 1 2 2 0
5 Laminar structure     
 (a) Leaf size 1 1 1 1
 (b) Texture 1 1 1 0
 (c) Hardiness 1 1 1 0
6 Socio-economic value 2 2 2 0
 Total (+) 10 12 12 6
 API (%) 62.50 75 75 37.50
 API Grade 4 5 5 2
Assessment Good Very good Very good Poor