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1-hour NO2 Modeling Issues

1-hour NO2 Modeling Issues. WESTAR Spring 2011 Business Meeting. The Issues for New Mexico. Many NOx sources in the state Refined methods needed to demonstrate compliance Statutory deadlines for permit issuance

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1-hour NO2 Modeling Issues

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  1. 1-hour NO2 Modeling Issues WESTAR Spring 2011 Business Meeting

  2. The Issues for New Mexico • Many NOx sources in the state • Refined methods needed to demonstrate compliance • Statutory deadlines for permit issuance • Refined model methods not tested for accuracy with refined methods, such as PVMRM • USEPA guidance suggests myriad of analyses not possible to accomplish within deadlines

  3. AERMOD Workgroup • Convened by USEPA • Over 50 participating state and local representatives • Currently constructing generic scenarios • State will model and demonstrate results in June • USEPA to present conclusions Fall 2011

  4. NMED/AQB Modeling Guidelines • Rely on monitor data for 1-hour NO2 in short-term • No modeling required for 1-hour NO2 pending outcome of AERMOD workgroup • Propose and justify use of MRM • Use background monitor concentrations rather than modeled background

  5. What is MRM? • Monitored Ratio Method • Compares NOx concentrations to NO2/NOx ratios to determine upper bound conversion • In-stack ratio determines lower bound conversion • Easily applied as a post-processor to modeling results

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