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| | [[Exceptional_Air_Pollution_Event_Analysis_Community_Workspace|< Back to Exceptional Event Workspace]]<br> | | [[Exceptional_Air_Pollution_Event_Analysis_Community_Workspace|< Back to Exceptional Event Workspace]]<br> |
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| − | [[Evidence for Flagging Exceptional Events|Evidence for Flagging Exceptional Events]] | + | [[Evidence for Flagging Exceptional Events|Required Evidence for Flagging Exceptional Events]] |
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| − | ==What Evidence is Required to Flag an Exceptional Event? (EE)==
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| − | 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:
| + | === PM COmpliance Trend === |
| − | # The event satisfies the criteria that it was '''''not reasonably controllable or preventable'''''
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| − | # There would have been no exceedances or violation '''''but for''''' the event.
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| − | # The event is associated with a measured value in '''''excess of historical values'''''.
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| − | # There is a '''''clear casual relationship''''' between the measured value and the event
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| − | === 1. Evidence: Not Reasonably Controllable or Preventable === | |
| − | This line of evidence needs to establish that the event is 'not reasonably controllable or preventable'. The EE Rule identifes different [[EPA_Example_EE_Categories| categories of uncontrollable]] events:
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| − | * Exceedances Due to Transported Pollution (Transported African, Asian Dust; Smoke from Mexican fires; Smoke & Dust from Mining, Agricultural Emissions)
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| − | * Natural Events (Nat. Disasters.; High Wind Events; Wildland Fires; Stratospheric Ozone; Prescribed Fires)
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| − | * Chemical Spills and Industrial Accidents; Structural Fires; Terrorist Attack
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| − | [[image:ForestSmokePic.png|200px]] [[image:DustFrontPic.png|200px]] [[image:Volcano.png|200px]] [[image:July4th_04_S.png|200px]]
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| − | === 2. Evidence: The Exceedance or Violation would not Occur, ''But For'' the Exceptional Event ===
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| − | According to the EE Rule, observationas can be EE-flagged if the vioaltion is caused by the exceptional event.
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| − | * The leftmost figure shows a case when the 'exceptional' concetration raises the level above the standard. A valid EE to be flagged.
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| − | * In the next case, the concentration from controllable sources is sufficient to cause the exceedance. This is not a 'but for' case and should not be flagged.
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| − | * In the third case, there is no exceedance. Hence, there is no justification for an EE flag.
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| − | [[Image:EE_ButForSchematics.png|200px|The 'exceptional' concetration raises the level above the standard]]
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| − | [[Image:Image-EE NoButFor1Schematics.png|200px|The 'exceptional' concetration raises the level above the standard]]
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| − | [[Image:Image-EE NoButFor2Schematics.png|200px|The 'exceptional' concetration raises the level above the standard]]
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| − | <br>
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| − | Illustration Exceptional Events, EE and non-EE events by the EE Rule.
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| − | === 3. Evidence: The Event is in excess of the Historical Values ===
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| − | === 4. Evidence: Clear Causal Relationship between the Data and the Event ===
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| − | There are multiple lines of evidence that can support the relationship between observations and the event. In the Exploratory Study the following lines of evidence were suggested:
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| − | * Chemical Signature
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| − | * Observed Pollutant Source and Transport
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| − | * Spatial Pattern of Pollutant
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| − | * Temporal Pattern of Pollutant
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| − | However, additional lines of evidence should be considered and illusterated. Community participation would be most desirable.
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