GOLDEN TRIANGLE PROGRESS TOWARDS OZONE ATTAINMENT

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GOLDEN TRIANGLE PROGRESS TOWARDS OZONE
ATTAINMENT
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Outline

• 2006 ozone levels
• Ozone trends
• Ozone precursor trends

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The SETRPC Air Quality Monitoring Network
LEGEND Air Toxics Sites Air Toxics,
Ozone, NOx Sites Ozone, NOx Sites
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Southeast Texas Ozone MonitorsSETRPC and TCEQ
Sites
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EPA Ozone Air Quality Index
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2006 Daily Maximum 1-Hour Ozone All TCEQ and
SETRPC Monitors
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2006 Daily Maximum 8-Hour OzoneBeaumont
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2006 Daily Maximum 8-Hour OzoneWest Orange
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2006 Daily Maximum 8-Hour OzoneWest Port Arthur
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2006 Daily Maximum 8-Hour OzoneHamshire
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2006 Daily Maximum 8-Hour OzonePort Arthur
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2006 Daily Maximum 8-Hour OzoneSabine Pass
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2006 Daily Maximum 8-Hour OzoneMauriceville
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2006 Daily Maximum 8-Hour OzoneSE TX Regional
Airport
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The 8-Hour Ozone Standard

• To attain this standard, the 4th-highest daily
  maximum 8-hour ozone level measured in a year
  must not exceed 84 ppb (when averaged over 3
  consecutive years)
• All monitoring sites must pass the attainment
  test

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2006 8-Hour Ozone Summary
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2004-2006 8-Hour Ozone Summary
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8-Hour Ozone2004 2006 4th Highest Daily Max
(ppb)

• Attainment of the 8-hour standard is not based on
  the number of exceedance days
• Instead, attainment is determined by the 4th
  highest daily maximum 8-hour ozone level
  averaged over three consecutive years
• Sabine Pass is only nonattainment monitor

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8-Hour Ozone Then and Now
1991 - 1993
2004 2006
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8-Hour Trend 4th Highest Daily MaxLong-Term
Progress Toward Attainment
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Ozone Precursor Emission Trends