Ozone production rate and hydrocarbon reactivity in 5 urban areas: A cause of high ozone concentration in Houston




Kleinman LI
Daum PH
Imre D
Lee YN
Nunnermacker LJ
Springston SR
Weinstein-Lloyd J
Rudolph J

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Observations of ozone (O3) and O3 precursors taken from aircraft flights over Houston, TX, Nashville, TN; New York, NY; Phoenix, AZ, and Philadelphia, PA show that high concentrations of reactive volatile organic compounds (VOCs) in the Houston atmosphere lead to calculated O3 production rates that are 2 to 5 times higher than in the other 4 cities even though NOx concentrations are comparable. Within the Houston metropolitan area, concentrations of VOCs and O3 production rates are highest in the Ship Channel region; the location of one of the largest petrochemical complexes in the world. As a consequence the concentration of O3 in the Houston metropolitan area has recently exceeded 250 ppb, the highest value observed in the U.S within the past 5 years




AIRCRAFT, Hydrocarbons, Lead, Nitrogen oxides, Organic compounds, Ozone, Petrochemicals, Production, Volatile organic compounds