1. Planning to Achieve the 8-Hour Ozone Standard
Houston-Galveston-Brazoria
8 County Non-Attainment Area
Rice Sustainability Center
October 6, 2004
Doug Deason - ExxonMobil

2. 8-Hour Ozone Discussion Items
Issue Background
HGA’s Classification & Timing
Ozone Source Mix
Planning Cycle
Questions & Answers

3. EPA – 8-Hour Ozone Standard
EPA performed mandatory 5-year review in 1997
8-hour standard is more stringent than the 1-hour
April 15, 2004 EPA designated & classified HGA as 8-hour nonattainment; effective June 15, 2004
Same 8-County area as before
State must submit 8-hour SIPs June 15, 2007
Attainment Deadline for Houston – June 15, 2010
Classification - Moderate (granted 6 years after designation to meet the standard - clock begins June 15, 2004)
Controls must be in place before the ozone season of 2009
Only four areas of the country given deadlines beyond 2010
All in California
Part of EPA’s planning process is to perform mandatory periodic reviews on standards. EPA analysis in 1997 indicated that the 1-hour was not as protective as public health and chose to change the standard nation wide to a more stringent 8-hour standard.
The 8-hour standard is 85 parts per billion that is measured over an 8-hour time frame. This means that the short ozone spikes we often see may not exist when the standard is averaged over an 8-hour time period. For reference, the region had 48 8-hour exceedances of the standard last year.
On April 15 EPA designated our region as nonattainment for the 8-hour standard with an attainment deadline of 2010 and a moderate classification.
8-Counties Harris Galveston Brazoria Fort Bend Chambers Montgomery Waller Liberty

4. 8-Hour Implementation Issues Attainment Classifications and Deadlines
8-Hour attainment classifications set by monitored 8-hour ozone design value
Classification table provides statutory number of years allowed for attainment
2010 Compliance Deadline for Houston area set in April , 2004 EPA Rule
Houston-Galveston-Brazoria (0.102 ppm)
2007
93% of the 8-Hour
Subpart 2 non-attainment
counties (243) fall
into these first two
classifications
2010
2013
15 CA counties are
serious
2019
No counties are
in Severe-15
4 CA counties are
Severe-17
2021
No counties are
in Extreme
2024

6. 2007 Controlled NOx Emissions About Equally Balanced Among Industrial , On-Road, and Off-Road
Sunlight
Little or no wind
High temperatures
Clear skies
OXYGEN
Ground Level
Ozone (O3)
Formation
Volatile Organic
Compounds (VOC)
Nitrogen Oxides
(NOx)
Sources: Houston Regional Monitoring and
Business Coalition for Clean Air

7. Keys to Success
Continued advancement in technology & cost effectiveness across all source types
Acceleration of Federal program benefits (Fuels/Engines, Transport and Regional Haze rules) to 2009, or
Significant new local controls that are available, technically feasible and cost-effective by 2Q09
Continued need for TERP-2 funding post 2007

8. 8-Hour Ozone - 1 Hour Measures Set the Stage
Many 8-hour ozone exceedances are driven by 1-hour exceedances
1-hour Measures effectively will work both
Some 8-hour ozone exceedances occur with NO 1-hour ozone exceedance
1-hour ozone measures reducing continuous emissions will reduce 8-hour ozone
Some 8-hour exceedances may be due to transport

9. Summary Statistics of One and Eight-Hour Exceedances

10. Summary Statistics of One and Eight-Hour Exceedances

11. Summary Statistics of One and Eight-Hour Exceedances

12. 8-Hour Ozone Schedule 2004 2005-2006 2007 2010 2013-24 EPA
Designates
Areas
4/15/04
Attainment Deadline
for Houston & >95% of
non-attainment areas nation-wide
TEXAQS II
TX Submits Adopted State Implementation Plan (by 6/2007)
EPA
Finalizes
Phase 1
Rule
(04/15/ 04)
Attainment Deadlines
for Remaining 19
Counties Nation-wide
Develop SIP Modeling & Control Strategies
2004
2007
2010

13. Outlook for 2005 & 2006
1-hour SIP Measures (NOx Reductions , HRVOC Monitoring, and new HRVOC Emission Limits) continue to implement
TEXAQS 2000 Study data analysis continues
New Science data (TCEQ, TERC, and TARC) generation and analysis continues
Houston modeling improvements continue
TEXAQS-2 Field work and data analysis informs 8-hour ozone SIP