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|Title: ||Roadside air pollution in a tropical city: physiological and biochemical response from trees|
|Authors: ||Uka, Ufere N.|
Belford, Ebenezer J. D.
Hogarh, Jonathan N.
|Keywords: ||Air quality|
Air pollution Tolerance Index
Anticipated Performance Index
|Issue Date: ||Jun-2019|
|Publisher: ||Bulletin of the National Research Centre|
|Citation: ||Bulletin of the National Research Centre, 43(1):90|
|Abstract: ||Background: The economic growth and social interaction of many developing countries have been enhanced by
vehicular transportation. However, this has come with considerable environmental cost. The vehicular emissions of
gases such as carbon monoxide (CO), sulphur dioxide (SO2), nitrogen oxide (NOx) and volatile organic compounds
(VOC’s) among others are associated with vehicular transportation. The resultant effect can lead to respiratory
infections in humans, as well as growth inhibition and death of animals and plants. An investigation was conducted
to evaluate the impact of vehicular air pollutants on some selected roadside tree species in the Kumasi Metropolis,
Ghana. Ficus platyphylla, Mangifera indica, Polyalthia longifolia and Terminalia catappa, which were abundant and
well distributed along the road sides, were selected for the study. Three arterial roads in the Kumasi Metropolis,
namely Accra Road (Arterial I), Offinso Road (Arterial II) and Mampong Road (Arterial III), were considered as different traffic
volumes experimental sites. The KNUST campus was selected as a control site. Diurnal analysis of CO, NO2, SO2 and VOC
was monitored in the sample sites. Three replicates of each tree species were defined at a distance 10 m away from the
edge of the road. Physiologically active leaves (20 to 25) from each tree species replicate were harvested for physiological
and biochemical determination.
Results: The ambient air quality data showed higher levels at the arterial road sites, which were severely polluted based
on air quality index. The biochemical studies revealed reductions in leaf total chlorophyll and leaf extract pH whilst leaf
ascorbic acid and relative water contents increased at the arterial road sites.
Conclusion: It was found that the plants’ tolerant response level to vehicular air pollution was in the order T.
catappa > F. platyphylla > M. indica and P. longifolia. Based on anticipated performance index, it was revealed
that M. indica, F. platyphylla and T. catappa might be performing some level of air cleaning functions along
the arterial roads. Whilst P. longifolia was poor and unsuitable as a pollution sink.|
|Description: ||This article has been published in Bulletin of the National Research Centre and is available at DOI: 10.1186/s42269-019-0117-7|
|Appears in Collections:||College of Science|
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