Urban dust pollution tolerance indices of selected plant species for development of urban greenery in Delhi

Assessment of the Air pollution tolerance capacity of trees for development of greenery around the industrial area

“…The Moringa oleifera revealed highest APTI value for 13.83 and Butea monosperma showed lowest APTI value for 7.81 (Figure 1). Similar result of air pollution tolerance index was reported (Gupta et al, 2020;Kaur and Nagpal, 2017;Patel et al, 2023). Almost all the tree species showed tolerance response against the air pollution in industrial sites while the Butea monosperma was found to be sensitive to air pollution (Table 2).…”

Identifying Common Trees and Herbaceous Plants to Mitigate Particulate Matter Pollution in a Semi-Arid Mining Region of South Africa

“…The combined advantages of planting evergre filters are expected to maximize cumulative mitigat ing-smelting environments of the study locality. round, tree canopies act as a sink of PM, complex resulting in greater dust deposition on foliage and taining PM [14,15,[27][28][29]. Herbaceous plants immo along roads because traffic is a major source of PM resuspension from the soil, are feasible for inclusi are recognized as ruderal species to re-establi [11,13,16,18,19].…”

“…The combined advantages of planting evergreen trees and herbaceous plants as dust filters are expected to maximize cumulative mitigation effects in heavily air-polluted miningsmelting environments of the study locality. Evergreen trees collect dust all year round, tree canopies act as a sink of PM, complex tree structures resist wind movement resulting in greater dust deposition on foliage and tree bark could absorb toxic metal containing PM [14,15,[27][28][29]. Herbaceous plants immobilize dust at ground level, especially along roads because traffic is a major source of PM at surface level, limit hazardous dust resuspension from the soil, are feasible for inclusion in most outdoor urban spaces, and are recognized as ruderal species to re-establish vegetation in disturbed habitats [11,13,16,18,19].…”

“…The study of SEM micrographs (Figure 4) revealed leaf surface micromorphological features of the six preferred trees and herbaceous species. Rough surfaces created by epicuticular cell outlines (in all six species, Figure 4a-l 4e) and glandular trichomes (G. fruticosus, Figure 4i, not visible on the selected image of abaxial side, Figure 4j) were indicated as the key traits that increased dust deposition on both leaf surfaces of these species [1,14,29,33,40,41]. Micrographs further clarified that densely packed trichomes on abaxial leaf surfaces of O. paniculosa (Figure 4d) and P. guajava (Figure 4f) created a protective layer that could have restricted dust adhesion [42,43], which explains their comparatively low dust counts (see Section 3.1, Figure 2a).…”