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In 2005, Congress identified a need to account for events that result in exceedances of the National Ambient Air Quality Standards (NAAQS) that are exceptional in nature (e.g., not expected to reoccur or caused by acts of nature beyond man-made controls). In response, the U.S. EPA promulgated the Exceptional Events Rule (EER) to address exceptional events in 40 CFR Parts 50 and 51 on March 22, 2007 (72 FR 13560). On May 02, 2011, in an attempt to clarify this rule, the U.S. EPA released draft guidance documents on the implementation of the EER to State, tribal and local air agencies for review.
Due to the arid nature of the state, Arizona is susceptible to both windblown dust events and smoke events from forest fire, both of which may qualify as exceptional events. These events may be captured by various air quality monitoring equipment throughout the state, sometimes resulting in exceedances or violations of the NAAQS. The EER allows for states and tribes to "flag" air quality monitoring data as an exceptional event and exclude those data from use in determinations with respect to exceedances or violations of the NAAQS, if the U. S. EPA concurs with the demonstration submitted by the flagging agency.
Information about the Exceptional Event Rule (EER) and how this rule affects planning throughout the state of Arizona
Natural and Exceptional Events Demonstration Documentation
- Exceptional Event Demonstrations for the Greater Phoenix Area Submitted on February 13, 2013
- Exceptional Event Demonstrations for the Greater Phoenix Area Submitted on January 29, 2013
- Public Notice for 30-day Comment Period
- Affidavit of Publication in the Arizona Republic of the Public Notice for the 30-day Comment Period
- Public Comments received during the 30-day Comment Period
- Demonstration for August 3, 2011
- Demonstration for August 18, 2011
- Demonstration for August 25 – August 28, 2011
- Demonstration for February 19, 2011
- Demonstration for February 27, 2012
- Demonstration for January 21 – 22, 2012
- Demonstration for July 18, 2011
- Demonstration for November 4, 2011
- Demonstration for October 4, 2011
- Demonstration for September 2, 2011
- Errata Sheet for Demonstrations Submitted on December 3, 2012
- Exceptional Event Demonstration for the Yuma Area Submitted on January 29, 2013
- Exceptional Events Demonstration in the Greater Phoenix Area during July 02 - 08, 2011
- Exceptional Event Demonstration for March 02, 2008 - Yuma, Arizona
- Reengineered Exceptional Events Analysis Reports for 2008
- 2008 Final Demonstrations for Exceptional Events in the Greater Phoenix Area
- 2007 Final Demonstrations and Comment Period for Exceptional Events
Potential Exceptional Events
Natural and Exceptional Event Plans
Additional Documents
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