Citation:

Beaver, M., R. Long, K. Kronmiller, R. Duvall, S. Kaushik, T. Morphy, AND P. King. Ambient intercomparison of direct and indirect methods for ambient nitrogen dioxide. National Ambient Monitoring Conference, Atlanta, GA, August 11 - 14, 2014.

Impact/Purpose:

The National Exposure Research Laboratory (NERL) Human Exposure and Atmospheric Sciences Division (HEASD) conducts research in support of EPA mission to protect human health and the environment. HEASD research program supports Goal 1 (Clean Air) and Goal 4 (Healthy People) of EPA strategic plan. More specifically, our division conducts research to characterize the movement of pollutants from the source to contact with humans. Our multidisciplinary research program produces Methods, Measurements, and Models to identify relationships between and characterize processes that link source emissions, environmental concentrations, human exposures, and target-tissue dose. The impact of these tools is improved regulatory programs and policies for EPA.

Description:

AbstractRecent advances in measurement techniques for nitrogen dioxide (NO2), along with known interferences in the current Federal Reference Method (FRM) have created the need for NO2 measurement method research within EPA’s Office of Research and Development. Current methodologies under investigation include photolytic conversion of NO2 prior to detection by chemiluminescence and direct, optical cavity-based techniques. Advantages and disadvantages of each measurement approach will be discussed. Ambient intercomparison data of NO2 measurement methods from the Houston, TX and RTP, NC areas will be presented. Implications for near roadway monitoring and NAAQS compliance monitoring will be discussed.Disclaimer: Although this work was reviewed by EPA and approved for publication, it may not necessarily reflect official Agency policy.

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