Air toxics monitoring and analysis laboratory performance evaluation
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Air Toxics Monitoring and Analysis: Laboratory Performance Evaluation. Van Shrieves, Chief Monitoring & Technical Support Section. Background/Issues.

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Air Toxics Monitoring and Analysis: Laboratory Performance Evaluation

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Air Toxics Monitoring and Analysis: Laboratory Performance Evaluation

Van Shrieves, Chief

Monitoring & Technical Support Section


  • In 2006, Sonoma Technology Inc. completed a one year study focused on analyzing air toxics monitoring data collected by Region 4 state and local agencies from 1990 – 2005

  • Some of the key findings included:

    • Key risk drivers are not measured well enough to determine risk

    • Large differences in sampling and analysis methodology and MDLs among reporting agencies

    • MDLs in the Southeastern region are higher than in other areas of the nation

Goals for Addressing Key Issues

  • Conduct interlaboratory comparisons to establish consistency in the analysis methodology and MDLs between reporting agencies

  • Provide resources to regional laboratories such as training/information exchange and funding for analytical equipment upgrades

Completed Tasks

  • Regional air toxics workgroup formed with representatives from SC, Hillsborough County, FL, and EPA Region 4

  • MDL air toxics survey distributed by EPA Region 4; results showed a significant number of VOC MDLs are higher than benchmark MDLs provided by the NATTS TAD

  • Laboratory equipment survey distributed by EPA Region 4 showed some variations in systems used to analyze VOCs and carbonyls

Next Steps for 2008

  • Development of a Region 4 Organic Chemists Workshop – 1 to 2 day workshop primarily to allow for the exchange of information regarding methods used for VOC and carbonyl analyses and correlations to the MDLs

  • Performance studies – regional labs will participate in the NATTS proficiency testing in 2008

  • Assess equipment needs for laboratory upgrades and determine funding sources

State/Local Agency Support

  • Long-term Funding Commitment to address sampling and analytical needs and workshop/training participation





Health-based concentration

(e.g., Concentration = Risk of 1E-06)

Possible Analytical Sensitivity Points of Departure for Exposure Assessment (i.e., “risk-based DQOs for method sensitivity)


ATRA indicates you should do it this way


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