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PREPARING TO MEASURE THE EFFECTS OF THE NOX SIP CALL - METHODS FOR AMBIENT AIR MONITORING OF NO, NO2, NOY AND INDIVIDUAL NOZ SPECIES
Citation:
McClenny, W A., E. J. Williams, R. C. Cohen, AND J. Stutz. PREPARING TO MEASURE THE EFFECTS OF THE NOX SIP CALL - METHODS FOR AMBIENT AIR MONITORING OF NO, NO2, NOY AND INDIVIDUAL NOZ SPECIES. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION 52(5):542-562, (2002).
Impact/Purpose:
1. Provide the Agency with semi-continuous and real-time instrumentation for its monitoring of ozone, ozone precursors, and reaction products of ozone formation.
2. Provide the Agency with semi-continuous and real-time instrumentation for its monitoring of water-soluble PM components and water-soluble atmospheric gases.
Description:
The capping of stationary source emissions of NOx in 22 states and the District of Columbia is federally mandated by the NOx SIP Call legislation with the intended purpose of reducing downwind ozone concentrations. Monitors for NO, NO2, and the reactive oxides of nitrogen into which these two compounds are converted will record data to evaluate air quality model (AQM) predictions. Guidelines for testing of these models indicate the need for semi-continuous measurements as close to real time as possible but no less frequently than once per hour. The measurement uncertainty required for AQM testing must be less than +/- 20% (+/- 10% for NO2) at mixing ratios of 1- ppbv and higher for NO, individual NOz component compounds, and NOy. This article is a review and discussion of different monitoring methods, some currently used in research and others used for routine monitoring. The performance of these methods is compared to the monitoring guidelines. Recommendations for advancing speciated and total NOy monitoring technology and a listing of demonstrated monitoring approaches are also presented.
The U.S. Environmenal Protection Agency through its Office of Research and Development collaborated in the preparation of this manuscript. It has been subjected to Agency review and approved for publication. Mention of trade names or commercial products does not constitute an endorsement or recommendation for use.