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The State of California's Air Resources Board has implemented a network for monitoring the levels of potentially toxic air contaminants (TACs) at 20 population centers throughout the state. The monitoring is designed to support a program to identify the presence of any TACs that are at levels which would require the adoption of emission control regulations. The network monitors concentrations of eleven organic gases and eight particulate metals. Pesticides are also monitored at various locations on an intermittent basis.
A substantial amount of work has been accomplished in developing and documenting TAC sampling and analysis methods, acquiring authoritative calibration standards, and implementing data quality assessment procedures. However, improvements are still needed in such areas as automating TAC analyzers, lowering the detection limits for TAC analysis methods, conducting interlaboratory validations of TAC analytical methods, producing National Bureau of Standards certified calibration gases at ambient TAC levels, and improving quality assurance/quality control documentation.
toxics, toxic air contaminants, organic gases, particulate metals, quality assurance, monitoring objectives, pollutant, air quality monitoring, limits of detection
Chief, Northern Laboratory BranchCalifornia Air Resources Board, Sacramento, CA