Abstract
Air pollutant concentration of Trivandrum, the capital of Kerala, exceeded the limits of National Ambient Air Quality (NAAQ) standards, according to a study conducted in 2015 by NATPAC. These polluted corridors harbour vegetation on roadsides and traffic islands, planted solely for aesthetic appeal. Analysis of air pollution tolerance levels of existing plants can act as a scientific basis for efficient planning of the urban landscape. Sixty-seven species, including flowering, fruit-bearing, ornamental, shade-providing and timber-yielding species, were screened for their relative resistance to air pollution. Based on leaf pH, relative water content, chlorophyll and ascorbic acid levels, the Air Pollution Tolerance Indices (APTI) of each species were formulated and they were grouped into the following: tolerant, moderately tolerant, intermediate and sensitive groups. Agave americana (18.40), Cassia roxburghii (17.63), Anacardium occidentale (11.97), Cassia fistula (11.60), Mangifera indica (11.59) and Saraca asoca (10.88) may be considered for planting near green spaces like roundabouts and near pollution prone industrial areas, as they belong to tolerant category. Comparison of APTI during summer and monsoon also revealed the stability of Agave americana, Saraca asoca, Ficus benghalensis, Peltophorum pterocarpum, Ficus elastica, Ixora finlaysoniana, Mangifera indica, Canna indica and Delonix regia in maintaining pollution tolerance even during water disparity. Agave americana, Anacardium occidentale, Ficus elastica, Mangifera indica, Syzygium cumini, Ficus benghalensis, Nerium oleander and Ficus benjamina were found to be suited for mass planting, as was evident from their Anticipated Performance Indices (API).
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Acknowledgements
Facilities: The Principal, University College, University of Kerala, Trivandrum.
Secondary data: Kerala State Pollution Control Board (KSPCB), Kerala Forest Department (KFD) and National Transportation Planning and Research Centre (NATPAC).
Funding
Kerala State Council for Science, Technology and Environment (KSCSTE)
Availed by: Ancy S. Watson
Purpose: Research Grant
Kerala Forest Department Fund (KFDF)
Availed by: Sudha Bai R.
Purpose: For Glass wares and chemicals
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Ancy S Watson: Conceptualization, investigation, writing original draft
Sudha Bai R: Supervision, validation, writing—review and editing, funding acquisition
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This work is financially supported by Kerala State Council for Science, Technology and Environment (KSCSTE), which provides the student fund and Kerala Forest Development Fund (KFDF), which ensures the project resources.
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Watson, A.S., Bai R, S. Phytoremediation for urban landscaping and air pollution control—a case study in Trivandrum city, Kerala, India. Environ Sci Pollut Res 28, 9979–9990 (2021). https://doi.org/10.1007/s11356-020-11131-1
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DOI: https://doi.org/10.1007/s11356-020-11131-1