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Presently, PM 2.5 (Particulate Matter up to 2.5 micrometers in size) causes health problems and affects human daily life. Previous studies found that some plants help to filter fine particles by trapping dust and particulate matters on their leaves, which can be washed for reuse. This research aims to use the leaves of the Bengal trumpet plant (Thunbergia grandiflora.) adhering to a design architecture to reduce the amount of PM2.5 flowing into buildings. The Bengal trumpet attached to the wire-mesh architecture located in front of the building’s door traps PM 2.5 on its leaves. The architecture obstructs the high flowing wind through the door. Research methods include PM 2.5 filtering in the test box, and wind resistance design to reduce wind speed using the Flow Design program. The results showed that Bengal trumpet leaves with a density of 85 leaves per 0.4 square meters could reduce PM2.5 up to 60%. The results of simulation with the Flow design program showed that wire-mesh architecture with half-cylinder form reduces wind speed more than that of cylinder forms for a similar surface area. This research confirms previous findings that plant leaves can trap fine particles. Furthermore, an architecture designed to moderate wind speed in appropriate direction with Bengal trumpet leaves can increase the filtering performance significantly.
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