UNMIX modeling of ambient PM2.5 near an interstate highway in Cincinnati, OH, USA

Shaohua Hu, Rafael McDonald, Dainius Martuzevicius, Pratim Biswas, Sergey A. Grinshpun, Anna Kelley, Tiina Reponen, James Lockey, Grace LeMasters

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


The "Cincinnati Childhood Allergy and Air Pollution Study (CCAAPS)" is underway to determine if infants who are exposed to diesel engine exhaust particles are at an increased risk for atopy and atopic respiratory disorders, and to determine if this effect is magnified in a genetically at risk population. In support of this study, a methodology has been developed to allocate local traffic source contributions to ambient PM2.5 in the Cincinnati airshed. As a first step towards this allocation, UNMIX was used to generate factors for ambient PM2.5 at two sites near at interstate highway. Procedures adopted to collect, analyze and prepare the data sets to run UNMIX are described. The factors attributed to traffic sources were similar for the two sites. These factors were also similar to locally measured truck engine-exhaust enriched ambient profiles. The temporal variation of the factors was analyzed with clear differences observed between factors attributed to traffic sources and combustion-related regional secondary sources.

Original languageEnglish (US)
Pages (from-to)378-395
Number of pages18
JournalAtmospheric Environment
Issue numberSUPPL. 2
StatePublished - 2006
Externally publishedYes


  • Air pollution
  • Diesel engine exhaust
  • Particles
  • Source apportionment
  • Traffic sources

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science


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