npj Urban SustainabilityDual effect of global urban trees on PM2.5 and associated health burdenHui SunYuchun NiFanhua KongLu LiangRoy M. HarrisonJeffrey BrookZhenyu GaiJie SuZhou ShenHaiwei Yin2026-06-03Full textDOI https://doi.org/10.1038/s42949-026-00415-z