Project at a Glance

Title: Association between long-term ultrafine particulate matter exposure and premature death

Principal Investigator / Author(s): Kleeman, Michael

Contractor: UC Davis

Contract Number: 14-314

Research Program Area: Health & Exposure

Topic Areas: Health Effects of Air Pollution, Modeling


A large body of literature shows associations between fine particulate matter (PM2.5) and premature death, with the most persuasive evidence coming from long term epidemiological studies. The epidemiological evidence for a similar relationship with ultrafine particles (UFP) is limited and inconclusive; the current study aimed to help fill this research gap. The overall objective of the proposed study was to identify features of UFP's (e.g. number, mass, constituents) associated with premature death in California. This study, which combined statewide modeling of UFP distribution with monitoring data, greatly strengthens the exposure analysis for UFPs relative to previous work that relied on central site monitors. The results of this study provide CARB with a clearer understanding of the health impacts associated with exposure to UFP, including health risk at ambient concentrations.

For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

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