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Mercury TMDL Update: Air Quality Modeling for North Carolina's Attainment Planning

This project involved using EPA's modeling files to analyze mercury air emissions in North Carolina. By running simulations with clean boundary conditions, the impact of local and global emissions on mercury deposition was evaluated. The results showed that a significant portion of mercury deposition in North Carolina originates from outside the state. Expected reductions in mercury emissions were projected for 2016 based on EPA regulations and planned shutdowns/conversions. The next steps include developing a Mercury Total Maximum Daily Load (TMDL) for North Carolina, with public feedback sought in early 2012.

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Mercury TMDL Update: Air Quality Modeling for North Carolina's Attainment Planning

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Presentation Transcript

  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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