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Project at a Glance

Project Status: complete

Report Published November 1989:

Title: Southern California air quality study quality assurance program.

Principal Investigator / Author(s): Collins, John

Contractor: ENSR Consulting and Engineering

Contract Number: A6-122-32

Research Program Area: Atmospheric Processes

Topic Areas: Field Studies, Monitoring


The methods and results of the Quality Assurance Program for the Southern California Air Quality Study (SCAQS) are described. The program included system audits by ENSR Consulting and Engineering, performance audits by the California Air Resources Board (ARB) and the South Coast Air Quality Management District (SCAQMD), and several laboratory intercomparison studies coordinated by ARB.

System audits included review of standard operational and quality control procedures submitted by all study participants, onsite system audits of AeroViroment (AV) for the SCAQS sampler, Environmental Monitoring Services, Inc. (EMSI) for ions and mass, Environmental Protection Agency (EPA) for elemental composition and speciated hydrocarbons, SCAQMD for routine continuous gasses, Tracer Technologies for tracers studies, Sonoma Technology, Inc. (STI) and University of Washington (UW) for airborne air quality and meteorological measurements, and T&B Systems for upper air soundings.

Continuous CO, SO2, O3, NOx, and total hydrocarbons (THC) analyzers operated by the ARB at Long Beach, by General Motors at Claremont, by SCAQMD at Los Angeles - North Main, and by STI and UW aboard the aircrafts were audited during the summer field study. ENSR Consulting and Engineering conducted system audits for all measurements to review operational and quality control procedures and provided overall management of the quality assurance program. Performance audits of continuous gas analyzers and ion analysis were conducted by the SCAQMD. Additionally, intercomparison studies were coordinated by the ARB for elemental analysis, speciated hydrocarbons, light absorption and peroxyacetyl nitrate.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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