NEAWMA 11 04 03 8 hr O3 revised

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Published on February 20, 2008

Author: Bina

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EPA's New Directions on Ozone :  EPA's New Directions on Ozone Bob Judge U.S. EPA - New England November 4, 2003 TOPICS:  TOPICS Recent Ozone Data and Trends 8-hr Ozone Designations 8-hr Ozone Implementation What is EPA’s Revised Ozone Standard?:  What is EPA’s Revised Ozone Standard? In 1997, EPA changed the averaging period of the standard from 1 hour to 8 hours to better address health effects from prolonged exposures. Values of 85 parts per billion (ppb) and above are exceeding the level of the 8-hour standard. Compliance with the standard is based on a 3-year average of the 4th highest ozone concentration at each monitor. Slide5:  What is the 8-hour Ozone Trend? 8-hr Ozone Designations:  8-hr Ozone Designations Designation Schedule:  Designation Schedule July 15, 2003 - States submit initial 8-hour recommendations, based on 2000-2002 data November, 2003 - EPA responds to States with any modifications (EPA must respond by December 15, 2003) April 15, 2004 - Promulgate 8-hour ozone designations Design Values in Northern New England (Based on 2000-2002 data):  Design Values in Northern New England (Based on 2000-2002 data) Design Values in Southern New England (Based on 2000-2002 data):  Design Values in Southern New England (Based on 2000-2002 data) March 28, 2000 Boundary Guidance:  March 28, 2000 Boundary Guidance Counties with violating monitors and nearby contributing areas should be part of nonattainment area. The Metropolitan Statistical Area or the Consolidated Metropolitan Statistical Area (C/MSA) serve as the presumptive boundary for 8-hour nonattainment areas (or 1-hour nonattainment area, if larger). States recommending nonattainment boundaries less than a C/MSA must document its rationale and address certain factors identified by EPA, such as population, traffic and commuting patterns, projected growth, prevailing meteorology, nearby sources and air quality. 8-hour Nonattainment Areas Recommended by States in 2003:  8-hour Nonattainment Areas Recommended by States in 2003 Governor’s recommendations are based on 2000-2002 data. Connecticut’s Recommendation:  Connecticut’s Recommendation Slide13:  Rhode Island’s Recommendation Slide14:  Massachusetts’ Recommendation Maine’s Recommendation:  Maine’s Recommendation Slide16:  New Hampshire’s Recommendation EPA Response to New England State Recommendations:  EPA Response to New England State Recommendations EPA will respond to each state in the near future. EPA unlikely to raise issues with the New England state recommendations 8-hr Ozone Implementation Guidance:  8-hr Ozone Implementation Guidance Current Schedule:  Current Schedule Slide20:  Important Implementation Rule Topics Nonattainment area classification approaches Attainment dates for nonattainment areas How EPA will transition from 1-hr to 8-hr ozone standard Requirements to prevent backsliding Reasonable Further Progress Modeling & attainment demonstration requirements Classifications and Attainment Dates:  Classifications and Attainment Dates EPA’s preferred option for classifications from June 2003 proposal Areas with 1-hour design values < 0.121 ppm, would be regulated under subpart 1 of the CAA. There would be no classification scheme. Attainment dates would generally be 5 yrs from designation, but can obtain additional 5 year extension. Areas with 1-hour design values > 0.121 ppm, would be regulated under subpart 2 of the CAA. These type of areas would receive subpart 2 classifications (e.g., marginal, moderate, etc.) according to their 8-hr ozone design value. Table of Translated 8-Hour Design Values:  Table of Translated 8-Hour Design Values Reopening of Public Comment Period Regarding Classifications:  Reopening of Public Comment Period Regarding Classifications Concerns expressed about possible unequal treatment between nonattainment areas with same 8-hour design values (e.g., some would be in Subpart 1, while others in Subpart 2) Concern about unrealistically early attainment dates for some areas EPA reopened the public comment period on Oct. 21, 2003 (68 FR 60054) with two alternative classification approaches relative to EPA’s initial “preferred approach.” Comments due November 5, 2003 Slide24:  Proposed Alternative A: - Translate the 0.121 ppm 1-hour value in the CAA to an equivalent 8-hour value (approx. 0.091 ppm), and shrink classification bands above 0.091 ppm by 50%. Areas with 8-hour design values of 0.091 ppm and above would be classified under subpart 2. Areas with 8-hour design values below 0.091ppm would be under subpart 1. Reopening of Public Comment Period Regarding Classifications Slide25:  Proposed Alternative B: Shrink classification bands above 0.085 ppm by 50%, resulting in lower 8-hour design values having a higher classification and longer attainment date. All areas with 1-hour design values greater than 0.121 ppm would be classified under subpart 2 based on its 8-hour design value. All areas with 8-hour design values greater than 0.091 ppm will be classified under subpart 2 based on its 8-hour design value. All other areas (i.e., areas with 1-hr DV’s of less than 0.121 ppm and 8-hr DV’s of less than 0.091 ppm) would be under subpart 1. Reopening of Public Comment Period Regarding Classifications Alternative Classifications Table:  Alternative Classifications Table Revocation of the 1-hour Standard:  Revocation of the 1-hour Standard EPA likely to revoke the 1-hour ozone standard in April, 2005. As part of the revocation, EPA may retain 1-hour ozone designations and classifications for those obligations that would provide benefits for attainment of the 8-hour standard. The 1-hour standard would not be retained for the 1-hour Rate of Progress and attainment plans, or for conformity analyses of the 1-hour standard after the conformity requirements for the 8-hour standard begin to apply. Anti-backsliding:  Anti-backsliding Subpart 2 “applicable requirements” in current 1-hr ozone nonattainment areas (e.g., I/M programs, RACT, stage II) would remain applicable after 1-hr standard is revoked. States may be able to discontinue programs once area achieves level of 1-hr standard. State would have to show that elimination of a program doesn’t interfere with attainment of the 8-hr standard. Reasonable Further Progress:  Reasonable Further Progress Proposal covers several issues, including: Requirement for 15% VOC reductions in first 6 years 2002 baseline year for starting (See recent EPA memo) Timing of RFP reductions relative to 2010 attainment date for moderate areas Timing of submission of RFP plan (2006 for 15%/ first 6 years ROP, 2007 for additional ROP/ Subpart 1 RFP) CAA requirements for creditability of control measures (Most reductions after 2002 are creditable.) Reasonable Further Progress:  Reasonable Further Progress For subpart 2 areas, should VOC emission reductions alone be required for the initial 15 percent progress period? Option 1. Continue to require 15 percent VOC reductions within 6 years of base year from all moderate and above 8-hour ozone nonattainment areas. After 6 years for moderate areas, RFP under subpart 1. Option 2. (Preferred approach) Exempt areas that have approved 15 percent plans under the 1-hour ozone standard from an additional 15 percent VOC-only requirement. Moderate areas are held to RFP under subpart 1. Modeling & Attainment Demonstration:  Modeling & Attainment Demonstration Areas with attainment dates beyond 2007 will need to submit attainment demonstrations to EPA in 2007. An attainment demonstration SIP consists of: technical analyses which identify the sources of emissions that are causing violations, identification of the VOC and NOx emissions reductions needed to provide for attainment by the area’s attainment date, and adopted measures that provide for those reductions. Future Programs That Will Address Ozone:  Future Programs That Will Address Ozone EPA and the states have implemented a wide variety of control strategies to reduce VOC and NOx emissions. Future strategies include: Tier 2/sulfur gasoline program for new cars and light-duty trucks starting 2004 2004 and 2007 NOx limits for heavy-duty diesel The NOx SIP Call starting 2003/2004 Federal non-road standards (rules for diesel equipment, lawn and garden equipment, marine engines, locomotives). Tighter non-road diesel standards just proposed. Next Steps on 8-hour Ozone Implementation:  Next Steps on 8-hour Ozone Implementation Respond to State nonattainment recommendation - November, 2003 Finalize 8-hour Ozone Implementation Rule - Early, 2004 Designate and classify 8-hour areas - April 15, 2004 State Ozone SIPs due - May, 2007 (Note: Some SIP requirements due May, 2006) Attainment dates – Some time between 2007 and 2017 in the Northeast depending on classification For Further Information:  For Further Information www.epa.gov/ttn/naaqs/ozone/o3imp8hr/ www.epa.gov/oar/oaqps/glo/designations Contact Bob Judge at 617-918-1045, or judge.robert@epa.gov

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