Figure 4: a) PCA biplot showing coordinates of the 15 motor vehicle dust samples plotted along axis 1 and axis 2. b) PCA biplot showing coordinates for the 74 recovered taxa plotted along axis 1 and axis 2. [Serial numbers used for the taxa are T-1=Asplenium sp., T-2=Polypodium sp., T-3=Pteris sp., T-4=Athyrium sp., T-5=Peranema sp., T-6=Christella sp., T-7=Pinus sp., T-8=Cryptomeria japonica, T-9=Rhododendron sp., T-10=Shorea robusta, T-11=Primula sp., T-12=Rutaceae, T-13=Betulaceae, T-14=Clematis sp., T-15=Aconitum sp., T-16=Carum copticum, T-17=Asteraceae (cf. Erigeron sp.), T-18=Tithonia sp., T-19=Polygonum sp., T-20=Xanthoxylum sp., T-21=Duabanga sp., T-22=Ilex sp., T-23=Cheno-ams, T-24=Alnus nepalensis, T-25=Michelia sp., T-26=Caryophyllaceae, T-27=Mangifera indica, T-28=Cocos nucifera, T-29=Alstonia sp., T-30=Poaceae, T-31=Coriandrum sp., T-32=Bombax sp., T-33=Borassus flabellifer, T-34=Syzygium cumini, T-35=Moraceae, T-36=Terminalia sp., T-37=Brassica sp., T-38=Psidium guajava, T-39=Parthenium hysterophorus, T-40=Asteraceae, T-41=Apiaceae, T-42=Peltophorum sp., T-43=Lagerstroemia sp., T-44=Plumeria sp., T-45=Butea sp., T-46=Delonix sp., T-47=Lantana camara, T-48=Eucalyptus sp., T-49=Argemone sp., T-50=Azadirachta indica, T-51=Clerodendrum sp., T-52=Acanthus ilicifolius, T-53=Heritiera fomes, T-54=Xylocarpus sp., T-55=Avicennia sp., T-56=Sonneratia apetala, T-57=Rhizophora mucronata, T-58=Exoecaria agallocha, T-59=Ceriops sp., T-60=Bruguiera sp., T-61=Nypa fruticans, T-62=Phoenix paludosa, T-63=Heliotropium sp., T-64=Barringtonia sp., T-65=Tamarindus indica, T-66=Aegialitis sp., T-67=Caesalpinia sp., T-68=Porteresia sp., T-69=Tamarix sp., T-70=Aegiceras sp., T-71=Kandelia sp., T-72=Derris sp., T-73=Diospyros sp., T-74=Unidentified].