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Defining the Problem with HRVOC (What we know)

Defining the Problem with HRVOC (What we know). October 6, 2003 – HRVOC Work Group Meeting. Typical Urban Area Ozone Exceedance. Explosive rate of ozone increase at Capitol Site 60 ppb/hr for 2 hours. Most Abundant VOC Species Identified at BR Capitol Site (Top 10 Represent 48% of Total VOC).

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Defining the Problem with HRVOC (What we know)

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  1. Defining the Problem with HRVOC(What we know) October 6, 2003 – HRVOC Work Group Meeting

  2. Typical Urban Area Ozone Exceedance

  3. Explosive rate of ozone increase at Capitol Site 60 ppb/hr for 2 hours

  4. Most Abundant VOC Species Identified at BR Capitol Site(Top 10 Represent 48% of Total VOC) propane n-butane ethane isopentane (2-methylbutane ) ethylene isobutane (2-methylpropane) propylene n-pentane toluene n-hexane

  5. VOC Species at BR Capitol SiteRanked by Ozone Forming Potential(Top 10 Represent 95% of Total Reactivity) ethylene propylene isoprene m/p-xylene 1-butene n-butane isopentane (2-methylbutane ) toluene o-xylene isobutane (2-methylpropane)

  6. Capitol Site – Monitored Emissions

  7. Capitol Site – Monitored Emissions

  8. Capitol Site 7.3% HRVOC Preceding Highest Ozone Reading

  9. Bayou Plaquemine Site 19% HRVOC Preceding Highest Ozone Reading

  10. VOC to NOx Ratios • The ratio of VOC concentration to NOX concentration can provide information as to the effect on the ozone concentration of changes in precursor concentrations. • If the VOC/NOX ratio is greater than approximately 6 – 9, the system is termed NOX-limited and decreases in NOX are expected to decrease ozone. • If the VOC/NOX ratio is less than 6 - 9, the system is termed VOC limited and decreases in NOX are expected to increase the peak ozone concentration

  11. NOx Limited VOC Limited VOC/NOx <4.0 Hydrocarbon Limited 8.0 Neutral >12 Nox Limited

  12. NOx Limited VOC Limited

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