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

Journal Article · Mon Feb 01 00:00:00 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]

---

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), Vol. 18:2; ISSN 0278-6826
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AEROSOLS
SAMPLING
AIR POLLUTION MONITORING
EVALUATION
AMMONIUM NITRATES
CALIFORNIA
CHEMICAL ANALYSIS
COGENERATION
DUSTS
EXPERIMENTAL DATA
LAWS
PETROLEUM REFINERIES
SULFATES
AMMONIUM COMPOUNDS
COLLOIDS
DATA
DEUS
DEVELOPED COUNTRIES
DISPERSIONS
INDUSTRIAL PLANTS
INFORMATION
MONITORING
NITRATES
NITROGEN COMPOUNDS
NORTH AMERICA
NUMERICAL DATA
OXYGEN COMPOUNDS
POWER GENERATION
SOLS
STEAM GENERATION
SULFUR COMPOUNDS
USA
540120* - Environment
Atmospheric- Chemicals Monitoring &amp; Transport- (1990-)
400100 - Analytical &amp; Separations Chemistry