Difference between revisions of "EE CompliancePatternTrend"

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[[Exceptional_Air_Pollution_Event_Analysis_Community_Workspace|< Back to Exceptional Event Workspace]]<br>
 
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[[Evidence for Flagging Exceptional Events|Required Evidence for Flagging Exceptional Events]]
 
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==What is na Exceptional Event? (EE)==
 
 
The Exceptional Events Rule requires states that flag data to satisfy the requirements of 40 CFR 50.14 (c)(3)(iii) to provide evidence that:
 
* the event satisfies the criteria that it was not reasonably controllable or preventable
 
* there would have been no exceedances or violation '''''but for''''' the event.
 
* the event is associated with a measured value in excess of historical values
 
* there is a clear casual relationship between the measured value and the event
 
 
===Not Reasonably Controllable or Preventable ===
 
 
[[Image:EE_ButForSchematics.png|150px]]  [[image:ForestSmokePic.png|150px]]    [[image:DustFrontPic.png|150px]]    [[image:Volcano.png|150px]]    [[image:July4th_04_S.png|150px]]
 
  
===No Exceedance or Violation ''But For'' the Exceptional Event ===
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=== PM2.5 Concentration Trend 2000-2006 ===
According to the EE Rule, observationas can be EE-flagged if the concentration exceeds the standard due to the exceptional event.
 
* The leftmost figure shows a case when the 'exceptional' concetration raises the level above the standard.
 
* In the next case, the concentration from controllable sources is sufficient cause the exceedance. Such an exceedance is not a 'but for' case and should not be flagged.
 
* In the third case, there is no exceedance, hence no justification for EE flag.     
 
[[Image:EE_ButForSchematics.png|250px|The 'exceptional' concetration raises the level above the standard]]
 
[[Image:Image-EE NoButFor1Schematics.png|250px|The 'exceptional' concetration raises the level above the standard]]
 
[[Image:Image-EE NoButFor2Schematics.png|250px|The 'exceptional' concetration raises the level above the standard]]
 
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Illustration Exceptional Events, EE and non-EE events by the EE Rule.
 
  
===The Event is in excess of the Historical Values ===
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Three-year aggregates of PM2.5. Left Images: Annual average PM10: Right Images: 98th Percentile.
  
== Spatial and Temporal Pattern of PM2.5 Compliance (Approximate)==
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Note the remarkable decline of both PM2.5 matric in the period 2000-2006 
  
 
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[[Image:2000_04_FRMPM25_Avg.png|400px]] [[Image:2005_08_FRMPM25_Avg.png|400px]]

Latest revision as of 16:55, July 11, 2008

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Required Evidence for Flagging Exceptional Events

PM2.5 Concentration Trend 2000-2006

Three-year aggregates of PM2.5. Left Images: Annual average PM10: Right Images: 98th Percentile.

Note the remarkable decline of both PM2.5 matric in the period 2000-2006

1999-2001

2000-2002

2001-2003

2002-2004

2003-2005

2004-2006

2005-2007


2000 04 FRMPM25 Avg.png 2005 08 FRMPM25 Avg.png