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Investigation of the Sources and Properties of Ultrafine Particles in Irvine, California

Undergraduate #180
Discipline: Chemistry and Chemical Sciences
Subcategory: Chemistry (not Biochemistry)

Maria Salazar - University of California, Irvine


Aerosols, or particles suspended in air contribute to the haze that is perceived as smog. Ultrafine particles (those with diameters smaller than 100 nm), released into the air can influence climate and cause health problems such as bronchitis and asthma. In this project, the group reports the factors that contribute to the formation and evolution of ultrafine particles in the Irvine area. This research will provide insights into the magnitude and sources of this important pollutant. The study utilizes data from a scanning mobility particle sizer, which is used to obtain the particle size distributions. Meteorological data and emissions inventories compiled were also incorporated but regulatory agencies like the US EPA were used to infer the composition of the aerosol particles. Our analysis shows that wind direction is critical for determining the amount of ultrafine particles present. Extended periods of higher concentrations correlate best with winds from the NE, most remarkably during periods of strong Santa Ana winds. The dominant wind direction from the NE also corresponds to brief but intense bursts of ultrafine particles, suggesting major sources of these pollutants also exist along the coast North of Irvine.

Funder Acknowledgement(s): UCI CAMP-LSAMP

Faculty Advisor: James Smith, jimsmith@uci.edu

Role: I conducted data analysis where my focus was placed on the motivating factors for aerosols particularly in the Irvine area.

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This material is based upon work supported by the National Science Foundation (NSF) under Grant No. DUE-1930047. Any opinions, findings, interpretations, conclusions or recommendations expressed in this material are those of its authors and do not represent the views of the AAAS Board of Directors, the Council of AAAS, AAAS’ membership or the National Science Foundation.

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