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EPA Update on Air Quality Standard for Ozone: Designations/Implementation for 2008 Standard Five Year Review of the Standard Carl Young U.S. EPA Region 6 December 5, 2011 1997 8-Hour Ozone Standards 0.08 parts per million (ppm) or 84 parts

SLIDE 1

EPA Update on Air Quality Standard for Ozone: Designations/Implementation for 2008 Standard Five Year Review of the Standard Carl Young U.S. EPA Region 6 December 5, 2011

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1997 8-Hour Ozone Standards

0.08 parts per million (ppm) or 84 parts per billion

(ppb)

3-year average of the annual fourth highest value at

any specific monitor must not exceed the standard

Primary Standard (Health) and Secondary Standard

(Welfare) set as the same

Designations and Classifications in 2004

SLIDE 3

2008 8-Hour Ozone Standards

March 2008, standards revised to 75 ppb
3-year average of the annual fourth highest value at any

specific monitor must not exceed the standard

Primary Standard and Secondary Standard set as the

same

Designations within 2 years

(may be extended by 1 year if insufficient information)

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Reconsideration of the 2008 Standards

September 2009: EPA to reconsider the

standards

Designations deferred until reconsideration is

complete

September 2011: President requests EPA to

withdraw reconsideration proposal

Planning to designate areas as either

“nonattainment” or “attainable/unclassifiable” for the 2008 ozone standard

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Designations for the 2008 Standards

“Nonattainment for areas:
violating the 75 ppb standards, or
contributing to violations in a nearby area
EPA intends to use quality assured ozone data for

designations (typically 2008 to 2010)

Texas updated nonattainment recommendations

(Dallas/Fort Worth and Houston)

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Action Target Date

EPA Letter to States on Intended Designations (120-day letters) December 9, 2011 Additional Information Requested from States End of February 2012 Designations and Classifications (Final) April 2012 Effective date June 2012 Broader Implementation Rule (Proposal/Final) Spring/Winter 2012 State Implementation Plans Due (or as directed in implementation rule) June 2015 Review of NAAQS (Proposal/Final) 2013 (Fall)/2014

Designation/Implementation Schedule

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2008-2010 vs. 2009-2011 Preliminary 8-hour Ozone Data

For 2008-2010, 3 Region 6 areas with a Design Value (DV) > 75 ppb:

DFW-86 ppb, Houston-84 ppb, Baton Rouge-78 ppb

In Region 4, Shelby County, TN (Memphis) > 75 ppb (2008-2010)
2009-2011 preliminary data now has 10 areas in Region 6 > 75 ppb.
For 2009-2011 preliminary ozone data, in addition to DFW-90 ppb, Houston-89 ppb,

Baton Rouge-82 ppb, the following seven areas are now over 75 ppb 8-hour ozone design value:

Shreveport-80 ppb
Longview-77 ppb
Beaumont-79 ppb
Crittenden County, AR-77 ppb
Oklahoma City-77 ppb
New Orleans-76 ppb
Tulsa-77 ppb

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Review of the Ozone NAAQS

Section 109(d) - review of NAAQS every 5 years

– Planning

Final review plan published 4/2011

– Integrated Science Assessment (ISA)

2nd External Review Draft published 9/2011

– Risk Exposure/Assessment – Policy Assessment – Rulemaking

To view documents from current review:

http://www.epa.gov/ttn/naaqs/standards/ozone/s_o3_index.html

SLIDE 10

For More Information

www.epa.gov/air/ozonepollution/
Carl Young, Air Planning Section Staff