Los Angeles Summer Midday Particulate Carbon: Primary and Secondary Aerosol

Barbara J. Turpin, James J. Huntzicker, Susan M. Larson, Glen R. Cass

Research output: Contribution to journalArticlepeer-review

164 Scopus citations


Aerosol sampling during photochemically active times across the Los Angeles Basin has provided evidence of secondary formation of organic aerosol from gas-phase precursors at midday. Ambient organic carbon/elemental carbon ratios exceeded the estimated ratio of organic carbon/elemental carbon in primary source emissions on most sampling days at all sites. The concentration of secondary organic aerosol was calculated by using ambient data and estimates of the organic carbon/elemental carbon ratio in primary source emissions. Nonparametric sign correlations comparing calculated secondary organic carbon concentrations with tracers of both primary and secondary aerosols supported the method used to quantify secondary organic carbon. Secondary organic aerosol appears to have contributed roughly half of the organic aerosol in Pasadena during midday summer conditions.

Original languageEnglish (US)
Pages (from-to)1788-1793
Number of pages6
JournalEnvironmental Science and Technology
Issue number10
StatePublished - Oct 1 1991

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry


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