PM[sub 10] and PM[sub 2. 5] compositions in California's San Joaquin Valley

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Aerosol Science and Technology; (United States)

DOI:https://doi.org/10.1080/02786829308959588· OSTI ID:6849318

Chow, J C; Watson, J G; Lowenthal, D H ^[1]; Solomon, P A ^[2]; Magliano, K L ^[3]; Ziman, S D ^[4]; Richards, L W ^[5]

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1. Univ. of Nevada System, Reno (United States)
2. Pacific Gas and Electric Company, San Ramon, CA (United States)
3. California Air Resources Board, Sacramento, (United States)
4. Chevron Research and Technology Company, Richmond, CA (United States)
5. Sonoma Technology, Inc., Santa Rosa, CA (United States)

An aerosol sampling study was carried out at six monitoring sites in California's San Joaquin Valley from June 14, 1988 through June 9, 1989. Concentrations of PM[sub 10] (particles < 10[mu]m in aerodynamic diameter) and PM[sub 2.5] (particles < 2.5[mu]m in aerodynamic diameter) mass, elements, water-soluble nitrate, sulfate, ammonium, sodium, potassium, and organic and elemental carbon were determined in 24-h aerosol samples collected during this period. Federal and state standards for PM[sub 10] were exceeded at both urban and nonurban sites. PM[sub 10] concentrations were generally highest during winter and were dominated by PM[sub 2.5] during this time. The coarse (PM[sub 10] minus PM[sub 2.5]) aerosol fraction constituted more than half of PM[sub 10] mass during the summer and fall. PM[sub 10] concentrations of secondary ammonium nitrate were elevated during the winter at all sites. Conversely, concentrations of coarse particle iron, indicative of geologically related dust, were higher under less humid conditions during the summer and fall. Regionwide meteorological and chemical transformation processes influence the secondary (nitrate and sulfate) components of PM[sub 10]. Elevated concentrations of coarse-particle dust, however, appear to originate from local emissions, such as agricultural and transportation-related activities, as well as region-wide emissions. 74 refs., 4 figs., 4 tabs.

• OSTI ID: 6849318
• Journal Information: Aerosol Science and Technology; (United States), Journal Name: Aerosol Science and Technology; (United States) Vol. 18:2; ISSN 0278-6826; ISSN ASTYDQ
• Country of Publication: United States
• Language: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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AEROSOLS
AIR POLLUTION MONITORING
AMMONIUM COMPOUNDS
AMMONIUM NITRATES
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CHEMICAL ANALYSIS
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DEUS
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DISPERSIONS
DUSTS
EVALUATION
EXPERIMENTAL DATA
INDUSTRIAL PLANTS
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LAWS
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NORTH AMERICA
NUMERICAL DATA
OXYGEN COMPOUNDS
PETROLEUM REFINERIES
POWER GENERATION
SAMPLING
SOLS
STEAM GENERATION
SULFATES
SULFUR COMPOUNDS
USA