The Los Angeles Aerosol Characterization and Source Apportionment Study: An Overview

Abstract

The Los Angeles Aerosol Characterization and Source nitrate, organic compounds and trace metals and ap-Apportionment Study (LA-ACSAS) is a decade-long portion their sources. This paper provides an overview laboratory and field study undertaken by the Southern of the study results and summarizes the important California Edison Company (SCE) to characterize the conclusions regarding the composition and sources of chemical composition of fine (d , < 3.5 pm) particles, PM,,, in the Los Angeles Basin, especially regarding PM,,,, in the Los Angeles Basin, in terms of sulfate, the organic fraction.

Source Resolution of Fine Particulate Polycyclic Aromatic Hydrocarbons Using a Receptor Model Modified for Reactivity

“…The mixed layer height in the Los Angeles air basin is observed to have strong seasonal variations, with heights ranging from about 100 m in February to 670 m in July. 35 McMurry and Anderson 36 reported fine OC and EC concentrations, measured with a MOUDI, at two inland sites (Clairmont and Rubidoux) in summer, and at two western sites (Long Beach and Los Angeles) in winter, 1987. The EC concentrations they reported were about a factor of two higher than the ones we report, and they also observed a seasonal variation with winter concentrations being about three times higher than in summer.…”

Aerosol Concentrations During the 1999 Fresno Exposure Studies as Functions of Size, Season, and Meterology

“…If particle densities are also assumed, then aerosol mass concentrations can be computed. For a starting point in this computation, it was assumed that the submicron aerosol had a speci c gravity of 1.7, a handbook value for ammonium nitrate or ammonium sulfate (Table 1); these compounds constitute a major portion of California aerosols (Young et al 1994). Particles between 0.55 and 3 ¹m were assumed to have a speci c gravity of 2.7, a handbook value for clay and similar minerals, because it was thought that soil components contribute to the coarse mode.…”

Motor Vehicle Contributions to Fine Carbonaceous Aerosol in Los Angeles

“…In 1987-88 only 73 CO data were available for analysis along with the aerosol data at Duarte. All particulate data at Duarte and Lennox were collected by Global Geochemistry Corp. (GGC) following standard quality control/quality assurance procedures (Young and Hering, 1994).…”