EE CompliancePatternTrend
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What Evidence is Required to Flag an 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.
- Tthe 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
1. Not Reasonably Controllable or Preventable
The EE Rule identifes different categories of uncontrollable events:
- Exceedances Due to Transported Pollution (Transported African, Asian Dust; Smoke from Mexican fires; Smoke & Dust from Mining, Agricultural Emissions)
- Natural Events (Nat. Disasters.; High Wind Events; Wildland Fires; Stratospheric Ozone; Prescribed Fires)
- Chemical Spills and Industrial Accidents; Structural Fires; Terrorist Attack
2. No Exceedance or Violation But For the Exceptional Event
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.
Illustration Exceptional Events, EE and non-EE events by the EE Rule.
3. The Event is in excess of the Historical Values
1999-2001
2000-2002
2001-2003
2002-2004
2003-2005
2004-2006
2005-2007