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UPDATE ON DAQ’S AIR QUALITY MEASUREMENTS & MERCURY STUDIES. NC DENR/DAQ Mercury/CO 2 Workshop Raleigh, NC April 19, 2004 Steve Schliesser Todd Crawford NC Division of Air Quality. Presentation Summary. DAQ Hg studies in Eastern NC - Waccamaw Study - Hg from Wet Deposition

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update on daq s air quality measurements mercury studies

UPDATE ON DAQ’S AIR QUALITY MEASUREMENTS & MERCURY STUDIES

NC DENR/DAQ

Mercury/CO2 Workshop

Raleigh, NC

April 19, 2004

Steve Schliesser

Todd Crawford

NC Division of Air Quality

presentation summary
Presentation Summary
  • DAQ Hg studies in Eastern NC

- Waccamaw Study

- Hg from Wet Deposition

- Ambient Air Hg near Chlor-alkali Plant

  • Charlotte-Mecklenburg Air Hg Study

- Four locations in 2002 & 2003

  • Summary / Conclusions & Plans
drivers for daq hg studies in eastern nc
Drivers for DAQ Hg Studies in Eastern NC
    • Blackwaters sensitive to Hg
    • 1970 – Cited Hg in Cape Fear River fish
    • Hg in Fish up to 1.5 ppm
    • Hg in H2O 10X Safe Drinking Level
    • Hg in Humans

- 3.4 ppm in Blood of Fish Eaters,

10X > Non Fisheaters

- 34 ppm in Hair of Fish Eaters

- Some of Highest Levels Recorded in US

  • Discovery of more widespread Hg issues
mercury deposition network mdn in eastern nc
Mercury Deposition Network (MDN) in Eastern NC
  • 2 MDN Sites in Eastern NC for Wet Deposition and Ambient Air Monitoring Starting in 1996
  • Annual Wet Deposition Data

from 9,000-19,000 ng/m3

  • Noticeable Reduction Trend from 1998-2002
mercury in ambient air near waccamaw mdn site
Mercury in Ambient Air near Waccamaw MDN Site
  • Total and Speciated Hg Air Monitoring

- TGM up to 300 ng/m3 –5 min Avg

- TGM Annual Avg 2.3 ng/m3

- TGM Background < 2 ng/m3

- RGM up to 300 pg/m3 – 2 hr Avg

- RGM background < 2 pg/m3

  • Air with Met Data Argued Chlor-Alkali Plant Main Contributor, Leading to Plant Closing in 1999
mecklenburg charlotte ambient mercury study in 2002 2003
Mecklenburg / Charlotte Ambient Mercury Study in 2002-2003
  • EPA NATA Study Predicted Mecklenburg County Atmospheric Mercury Levels in Top 5% of US Counties
  • Charlotte Surrounded by Mercury Emission Sources: Electric Utilities, Medical Waste Incinerator, Large Industrial Boilers
  • Given No Prior Data, DAQ Initiated Ambient Air Mercury Monitoring Study for TGM, RGM, Hg0
  • Setup 4 Sites around Charlotte

- One Near Downtown

- Other 3 in Suburbia

  • Completed Data Collection – Reported in 2004
summary conclusions
Summary & Conclusions
  • NC has / had relatively high Hg,

well above US average, in terms of:

- Emissions into ambient air

- Measurements in specific ambient airsheds

- Modeling in specific ambient airsheds

- Wet deposition levels

- Fish of selected species

- People who eat selected fish species

  • NC data suggests high humidity could reduce ambient RGM, while promoting wet deposition
future plans
Future Plans
  • Finalize Charlotte Area Ambient Mercury Monitoring Study Report
  • Consider Arrangements for New Hg Study in Piedmont, including:

- MDN Site(s) for wet deposition,

- Ambient Air Hg and Meteorological Monitoring

- Assessing Relationship Between Hg Emissions, Wet Deposition, Meteorology, & Ambient Air Levels

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