Transcript 1 hour NO2 presentation

2012 Spring Business Meeting
Seattle, Washington
• Review NO2 Modeling requirements to
identify issues causing difficulties;
• Identify and prioritize realistic solutions,
and;
• Forward solutions on to the Directors.
• Alan Schuler – Alaska DEC
• Clint Bowman – Washington Dept. of
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Ecology
Cyra Cain – Montana DEQ
Jeff Gabler – WESTAR Council
Phil Allen – Oregon DEQ
Tom Orth – Utah DEQ
Conference Calls
Identify and Prioritize Issues
• Identify and Prioritize Realistic Solutions
• EPA Participation (Roger Brode):
• Clarify and Explain Guidance Language
• Summarize Current/Future Activities
• Discuss EPA’s Position on Important Issues
• Summary Report from EPA’s 10th Conference on Air
Quality Modeling (Marty Gray – UT DEQ)
• Presented Work to Technical Committee
• Detailed Write-ups (see links in agenda)
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Temporary/Portable/Intermittent/
Seasonal Sources
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In-Stack Ratios
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Significant Impact Level (SILs)
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Background Ambient Ozone
Concentrations
Other Monitoring Needs
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Temporary/Portable/Seasonal/
Intermittent Sources
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Craft Letter to EPA Requesting Refined Definitions &
Clarifications Using Specific Examples (e.g.; Case-byCase)
In-Stack Ratios
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State agencies explore enhancements to compliance
testing and CEM programs that would allow the
instruments to report the in-stack ratio;
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Information compiled in national database to assist EPA
in proposing more representative NO2/NOx in-stack
ratios, and;
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Information used to identify default ratios that are
process based, or it may provide support for a lower 1hour NO2/NOx in-stack default ratio.
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Significant Impact Level (SIL)
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Seek EPA confirmation that they are willing to accept
higher interim values, or even alternative approaches
(such as a population-dependent range of values);
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NESCAUM States Use 10 ug/m3 for 1-hr NO2 SIL, and;
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The committee further request that EPA consider higher
SILs in their pending rulemaking.
Background Ambient Ozone
Concentrations
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Establish a database of all rural hourly ozone
concentrations, and corresponding NO2 and NOx values
from participating states, and;
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Additional monitoring may be required through
WESTAR financial assistance.
Modeled Background Concentrations
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Modeling domain could cover entire western state region
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Modeled O3, NOx, NO2 + monitored concentrations
(apply to other pollutants and interstate transport?)
Other Needs
• EPA Needs Additional Field Studies to Fully
Evaluate Modeling Options;
• Is WESTAR Willing to Fund a Case Study, or;
• Partnership with Other Regional Organization?
• Tasks Include:
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Identify participating facility
Collect ambient O3, NOx and meteorological data near NOx source
Measure/calculate NOx emissions and in-stack ratios
Compare modeled NO2 impacts to ambient NO2 concentrations
Committee will provide additional information if Directors support concept