1-hour NO2 Modeling Issues NACAA Spring Membership Meeting 2011.

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Presentation transcript:

1-hour NO2 Modeling Issues NACAA Spring Membership Meeting 2011

The Issues for New Mexico Many NOx sources in the state Refined methods needed to demonstrate compliance Statutory deadlines for permit issuance USEPA guidance suggests myriad of analyses not possible to accomplish within deadlines, especially for minor source permit issuance

Issues with PVMRM/AERMOD method NO + O3  NO2 PVMRM assumption: the entire plume is well- mixed Testing of PVMRM/ISCST3 for accuracy was limited Testing of PVMRM/AERMOD not done Ozone monitor location is critical to avoid underestimation of NO2

NMED analysis of rural monitoring data NMED monitoring sites include areas of dense NOx emissions from oil and gas exploration and production At high NOx concentrations, NO2/NOx ratio is consistently low Upper bound conversion rates can be conservatively calculated based on NOx concentrations Conclusion: At high NOx concentrations near sources, there is insufficient entrainment for complete conversion of NO to NO2

Empire Abo Monitoring Data

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

NMED Contacts Eric Peters: Sufi Mustafa: