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Original Articles

Determination of Particle Effective Density in Urban Environments with a Differential Mobility Analyzer and Aerosol Particle Mass Analyzer

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Pages 709-723 | Received 13 Dec 2005, Accepted 05 Mar 2006, Published online: 23 Aug 2006

Figures & data

FIG. 1 Schematic diagram of DMA-APM set-up.

FIG. 1 Schematic diagram of DMA-APM set-up.

FIG. 2 Location of sampling sites.

FIG. 2 Location of sampling sites.

FIG. 3 Number concentration downstream of APM versus APM classifying voltage for PSL spheres.

FIG. 3 Number concentration downstream of APM versus APM classifying voltage for PSL spheres.

TABLE 1 APM sampling parameters

TABLE 2 Ambient temperature and relative humidity ranges for all sampling locations

FIG. 4 Number concentration through DMA-APM as a function of APM voltage for atmospheric particles at I-710 with d me = 118 nm.

FIG. 4 Number concentration through DMA-APM as a function of APM voltage for atmospheric particles at I-710 with d me = 118 nm.

TABLE 3 Summary of APM measurements conducted in the Los Angeles Basin in September/October 2004

FIG. 5 Diurnal variation of effective density for 50 nm atmospheric particles in Riverside, CA.

FIG. 5 Diurnal variation of effective density for 50 nm atmospheric particles in Riverside, CA.

FIG. 6 Diurnal variation of effective density for 146 nm atmospheric particles in Riverside, CA.

FIG. 6 Diurnal variation of effective density for 146 nm atmospheric particles in Riverside, CA.

FIG. 7 Effective density variation with respect to particle mobility diameter at I-710. Data labels indicate percentage of number concentration measured for each particle size with respective effective density.

FIG. 7 Effective density variation with respect to particle mobility diameter at I-710. Data labels indicate percentage of number concentration measured for each particle size with respective effective density.

FIG. 8 Effective density variation with respect to particle mobility diameter at CA-110. Data labels indicate percentage of number concentration measured for each particle size with respective effective density.

FIG. 8 Effective density variation with respect to particle mobility diameter at CA-110. Data labels indicate percentage of number concentration measured for each particle size with respective effective density.

FIG. 9 Effective density variation with respect to particle mobility diameter at USC. Data labels indicate percentage of number concentration measured for each particle size with respective effective density.

FIG. 9 Effective density variation with respect to particle mobility diameter at USC. Data labels indicate percentage of number concentration measured for each particle size with respective effective density.

TABLE 4 Summary of average effective densities of different field locations and their fractal dimensions

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