HoustonGalvestonBrazoria HGB Area Monitored 8Hour Ozone Design Values 19852006 Presentation to Regio

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Houston-Galveston-Brazoria (HGB) AreaMonitored
8-Hour Ozone Design Values1985-2006Presentation
toRegional Air Quality Planning CommitteeApril
26, 2007G. Michael White, RAQPC, City of Baytown
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8-Hour Ozone Design Value

• 8-Hour Ozone Design Value for an ozone
  monitoring site is the average of the
  fourth-highest 8-hour ozone concentration in each
  of three consecutive years
• Ozone Design Value is the metric used to
  determine whether a monitor is attaining the
  8-hour ozone standard
• Analysis here used the monitoring data for all of
  the ozone monitors that satisfied all of the
  Federal Reference Method requirements
• The number and locations of monitoring sites
  varies from year to year due to monitors added,
  deleted, or relocated
• From 1985 to 2006, monitored ozone levels
  decreased significantly across the
  Houston-Galveston-Brazoria area
• Some monitors now have an ozone design value that
  attains the 8-hour ozone standard (for example,
  downtown Houston)
• Bayland Park is the only monitor with an ozone
  design value gt 100 ppbv considered to be
  primarily impacted by mobile sources

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