Chang P.-KGriffith S.MChuang H.-CChuang K.-JWang Y.-HChang K.-EHsiao T.-C.TA-CHIH HSIAO2022-03-222022-03-22202203043894https://www.scopus.com/inward/record.uri?eid=2-s2.0-85123240255&doi=10.1016%2fj.jhazmat.2021.128188&partnerID=40&md5=6638efe7e476309144223560c438137ehttps://scholars.lib.ntu.edu.tw/handle/123456789/598666Source-apportioned particle concentrations are necessary to properly evaluate the health impacts of air pollution. In this study, a measurement station was established at an urban roadside in northern Taiwan to the investigate lung deposited surface area (LDSA) concentration, a relevant metric for the adverse health effects of aerosol exposure, along with PM1 and equivalent black carbon (eBC) concentrations, particle number concentration (PNC), and particle size distribution (PSD). Through positive matrix factorization and multi-linear regression analysis, we attributed 57% of LDSA to traffic emissions over the entire study. During rush hour, the motorcycle fraction increased to 0.83 and LDSA (77.6 ± 9.9 ?m2/cm3) and PNC (14,000 ± 2400 particles/cm3) values peaked, while 74% of LDSA was attributed to traffic. The LDSA ratio, defined as the ratio of measured LDSA to that estimated from the particle size distribution with a spherical assumption, also increased, highlighting the greater degree of fractal morphology during rush hour. The relationship between LDSA emitted by traffic and PNC yielded a higher r2 (0.92) than the r2 between traffic LDSA and eBC (0.82). Finally, the excess lifetime cancer risk linked with traffic emission was 1.56 × 10-4 (i.e. 15.6 excess cancer cases for a population of 100,000 people) based on the LDSA apportionment results. ? 2022 Elsevier B.V.Excess lifetime cancer riskLung deposited surface areaMotorcycleParticle size distributionPM1Air pollutionBiological organsDiseasesFactorizationLight transmissionMorphologyMotorcyclesParticle sizeRegression analysisSize distributionArea concentrationsBlack carbonCancer riskDeposited surface areasParticle number concentrationParticles-size distributionsTraffic emissionsParticle size analysisblack carbonparticulate organic mattercancerparticulate mattersource apportionmentsurface areaurban areaair pollutionairborne particleArticlecancer riskcircadian rhythmconcentration (parameter)dangerous goodslung cancermotorcycleparticle sizeparticulate matter 1.0risk assessmentsecondary organic aerosolTaiwantraffic and transporttraffic pollutionair pollutantanalysisenvironmental monitoringexhaust gashumanlungneoplasmtoxicityAir PollutantsAir PollutionEnvironmental MonitoringHumansLungNeoplasmsParticle SizeParticulate MatterVehicle Emissions[SDGs]SDG3[SDGs]SDG11[SDGs]SDG13journal article10.1016/j.jhazmat.2021.128188350078032-s2.0-85123240255