Screening Urban Tree Species for Air Quality Enhancement: A Review

Abstract

Air pollution poses a significant global challenge, particularly in urban areas, due to factors like industrialization, urbanization, increased vehicular traffic, and high energy consumption. In India, vehicle emissions, industrial activities, and power plants are major contributors to deteriorating air quality, with vehicles alone responsible for substantial carbon monoxide and hydrocarbon emissions. Unplanned urbanization and population growth further exacerbate pollution levels. Urban air pollution is linked to millions of deaths and respiratory illnesses annually, especially in developing countries. Vegetation plays a crucial role in mitigating air pollution by absorbing gaseous pollutants and particulate matter through leaves. Plants also act as bioindicators, displaying characteristic responses to specific pollutants. They employ mechanisms like leaf absorption, particulate deposition, and fallout on the leeward side to cleanse the atmosphere. Bio-monitoring with plants is a cost-effective method to assess environmental pollution impacts, highlighting the vital role of urban green spaces in improving air quality and public health. In summary, the screening of trees for pollution abatement is essential in urban planning. The APTI, coupled with assessing the dust-capturing capacity and emission reduction of trees, aids in categorizing them as sensitive indicators or effective pollution sinks.