AIR POLLUTION TOLERANCE INDEX OF SOME TREE SPECIES AROUND ELECTRICITY GENERATING HOUSES IN AHMADU BELLO UNIVERSITY MAIN CAMPUS, ZARIA, NIGERIA

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The  study  examined  the  Air  Pollution  Tolerance  Index  (APTI)  of  seven  different  tree  species  growing around  electricity  generating  houses  within  the  Ahmadu  Bello  University  (ABU)  Main  campus, Samaru.  Four  parameters,  leaf  relative  water  content  (RWC),  ascorbic  acid  content  (AA),  total chlorophyll  (TCH)  and  pH  of  leaf  extract  were  used  to  compute  the  APTI  of  the  tree  species.  Results indicate  the  order  of  tolerance  showing  Azadirachta  indica  (9.8) 

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