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In this study, the seasonal influence of tree shade on the UVI is evaluated from 210 hemispherical sky view images collected alongside public walkways and footpaths from 10 residential Brisbane suburbs. The effective sidewalk UV index is calculated underneath planted tree canopies, adjacent residential gardens, buildings and background tree species. Results are presented with respect to seasonal variations in the diurnal solar elevation for each month of the year at Brisbane's latitude. The research also examines the total reduction in UVI due to the presence of individual tree species, showing reductions in the midday UVI of up to 91% of an equivalent unimpeded sky hemisphere when overhead tree canopies are present. Important footpath tree species for peak midday UVI mitigation include <jats:italic>Pongamia pinnata<\/jats:italic>, <jats:italic>Xanthostemon chrysanthus<\/jats:italic>, <jats:italic>Senna siamea<\/jats:italic>, and <jats:italic>Libidibia ferrea<\/jats:italic>. The planting and maintenance of existing tree species already growing alongside residential Brisbane streets will improve the shade characteristics of suburbs and enhance UV protection for local residents.<\/jats:p>","DOI":"10.1111\/php.13988","type":"journal-article","created":{"date-parts":[[2024,6,27]],"date-time":"2024-06-27T04:35:29Z","timestamp":1719462929000},"page":"251-266","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The mitigating effect of street trees, urban flora, and the suburban environment on seasonal peak <scp>UV<\/scp> indices: A case study from Brisbane, Australia"],"prefix":"10.1111","volume":"101","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3191-6404","authenticated-orcid":false,"given":"Nathan James","family":"Downs","sequence":"first","affiliation":[{"name":"School of Mathematics, Physics and Computing University of Southern Queensland  Toowoomba Queensland 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