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Assessment of Natural Air Filtration Through Vegetated Building Environments

Abstract

Vegetated building environments can contribute to improved outdoor and indoor environmental quality by influencing the movement and concentration of airborne pollutants around buildings. Trees, shrubs, green walls, planted courtyards, roof gardens, and other forms of building-integrated vegetation can intercept particulate matter and modify local airflow. However, the effectiveness of vegetation as a natural air filtration strategy depends on plant characteristics, spatial arrangement, climatic conditions, and pollutant sources. Assessing these relationships is therefore important for developing healthier and more environmentally responsive building environments. This study assesses natural air filtration through vegetated building environments, focusing on the capacity of vegetation to reduce the movement and concentration of airborne pollutants around occupied buildings. It examines vegetation integrated into building sites, courtyards, façades, balconies, rooftops, and other architectural spaces. The study considers how different vegetation configurations influence pollutant interception and the quality of air reaching building entrances, windows, outdoor spaces, and ventilation openings. Particular attention is given to the role of plant characteristics in pollutant removal. Leaf density, surface texture, canopy structure, plant height, species characteristics, and seasonal growth patterns can influence the ability of vegetation to capture particulate pollutants. Dense vegetation may provide greater interception in some conditions, while excessive density can restrict beneficial airflow and alter pollutant dispersion. The study therefore examines the balance between filtration potential and airflow when evaluating vegetated environments. The interaction between vegetation, wind movement, and building form is also considered. Vegetation can slow, redirect, or channel airflow depending on its arrangement relative to buildings and prevailing wind directions. Properly positioned vegetation may reduce direct exposure to pollutants from roads and other sources while maintaining adequate ventilation around the building. The study therefore evaluates the relationship between vegetation placement, building orientation, setbacks, openings, and local wind conditions. Other factors, including traffic emissions, construction activities, background pollution levels, climate, maintenance practices, and irrigation requirements, are considered in assessing the effectiveness of natural air filtration. Vegetation alone may not eliminate outdoor air pollution, particularly where pollutant concentrations are high or airflow conditions limit interception. The study therefore considers vegetation as a complementary environmental strategy that can work alongside appropriate building envelope design, ventilation control, and site planning. The study aims to evaluate the potential of vegetated building environments to support natural air filtration and identify architectural and landscape strategies that can improve local air quality. Its findings are expected to assist architects, landscape architects, urban planners, and building designers in integrating vegetation into building environments for improved environmental performance. Properly designed vegetated spaces can contribute to pollutant interception, healthier outdoor surroundings, enhanced microclimates, and more sustainable relationships between buildings and their natural environments.

Keywords: Natural air filtration, Vegetated buildings, Air quality, Building environment, Vegetation, Particulate matter, Green infrastructure, Pollutant interception, Building-integrated vegetation, Urban greenery, Airflow, Landscape design, Environmental quality, Sustainable architecture.