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Enhancing Air Quality: Modeling for Mercury TMDL Update

This project, led by Laura Boothe, involved analyzing EPA's modeling files and 2005 mercury air emission data to assess the impact of North Carolina's emissions on air quality. Using the Community Multiscale Air Quality model, the study found that a significant portion of mercury deposition in North Carolina is from local sources. The findings informed the development of a Mercury Total Maximum Daily Load (TMDL) for the state, with projected emission reductions from EPA regulations. The next steps include engaging stakeholders for feedback and finalizing the TMDL for implementation.

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Enhancing Air Quality: Modeling for Mercury TMDL Update

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  1. Air Quality Modeling For Mercury TMDLUpdate Laura Boothe Attainment Planning Branch Supervisor January 11, 2012

  2. Background Information • Used EPA’s modeling files • 2005 mercury air emission files • 2005 meteorology files • EPA’s version of the Community Multiscale Air Quality (CMAQ) model used for mercury deposition modeling • Zeroed out North Carolina’s mercury air emissions to understand the impact of North Carolina’s air emission sources on North Carolina • Ran model with clean boundary conditions to understand impact of the global air emissions on North Carolina

  3. National Breakdown of Mercury Air Emissions Based on EPA’s 2005 Data

  4. 12-km Modeling domain

  5. Air quality Modeling Results • Zero out run indicated ~16% of the mercury deposition in North Carolina is coming from air emission sources in North Carolina • Clean boundary conditions indicate that 70% of the mercury deposition in North Carolina comes from outside of the 12-km modeling domain

  6. Expected Reductions in NC’s Mercury air Emissions *2016 projected emission include EPA’s proposed Electric Generating Units and Boiler Maximum Achievable Control Technology (MACT) Rules and planned shutdowns/fuel conversions

  7. Next Steps • DWQ is developing a Mercury Total Maximum Daily Load (TMDL) for North Carolina based in part on air quality modeling • January 2012 • Final draft TMDL completed • Draft Implementation • February 2012 • Final draft TMDL available to public • Request feedback • March 2012 • EMC informational item • Stakeholder meetings

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