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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


    Eastern nc mercury emission sources
    Eastern NC Mercury Emission Sources


    Mdn us network in 1999 nc08 lake waccamaw site nc42 pettigrew state park site
    MDN US Network in 1999 (NC08 = Lake Waccamaw site, NC42 = Pettigrew State Park site.)


    Mdn wet deposition collection system
    MDN Wet Deposition Collection System


    Annual cumulative hg wet deposition
    Annual Cumulative Hg Wet Deposition


    Mercury wet deposition as volume weighted avg concentration ng l by season site year

    .

    Mercury Wet Deposition, as Volume-Weighted Avg Concentration (ng/L) by Season, Site & Year.


    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



    Riegelwood ballpark tgm vs wind direction 1999
    Riegelwood Ballpark, 1999TGM vs. Wind Direction, 1999



    Comparison of hg deposition eastern nc regional emissions
    Comparison of Hg Deposition Elemental Mercury, & Meteorology& Eastern NC Regional Emissions


    Mecklenburg charlotte ambient mercury study in 2002 2003
    Mecklenburg / Charlotte Ambient Mercury Study in 2002-2003 Elemental Mercury, & Meteorology

    • 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




    Location and size of nc electric utility plants
    Location and Size of Concentrations NC Electric Utility Plants


    Summary conclusions
    Summary & Conclusions Concentrations

    • 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 Concentrations

    • 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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