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Primary and secondary sources of formaldehyde in urban atmospheres: Houston Texas region

Parrish, D. D. (author)
National Oceanic and Atmospheric Administration
Ryerson, T. B. (author)
National Oceanic and Atmospheric Administration
Mellqvist, Johan, 1965 (author)
Chalmers tekniska högskola,Chalmers University of Technology
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Johansson, John, 1982 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Fried, A. (author)
National Center for Atmospheric Research
Richter, D. (author)
National Center for Atmospheric Research
Walega, J. G. (author)
National Center for Atmospheric Research
Washenfelder, R. A. (author)
National Oceanic and Atmospheric Administration,University of Colorado at Boulder
De Gouw, J. A. (author)
National Oceanic and Atmospheric Administration,University of Colorado at Boulder
Peischl, J. (author)
University of Colorado at Boulder,National Oceanic and Atmospheric Administration
Aikin, K. C. (author)
National Oceanic and Atmospheric Administration,University of Colorado at Boulder
McKeen, S. A. (author)
National Oceanic and Atmospheric Administration,University of Colorado at Boulder
Frost, G. J. (author)
University of Colorado at Boulder,National Oceanic and Atmospheric Administration
Fehsenfeld, F. C. (author)
University of Colorado at Boulder,National Oceanic and Atmospheric Administration
Herndon, S. C. (author)
Aerodyne Research, Inc.
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 (creator_code:org_t)
2012-04-05
2012
English.
In: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 12:7, s. 3273-3288
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We evaluate the rates of secondary production and primary emission of formaldehyde (CH2O) from petrochemical industrial facilities and on-road vehicles in the Houston Texas region. This evaluation is based upon ambient measurements collected during field studies in 2000, 2006 and 2009. The predominant CH2O source (92 +/- 4% of total) is secondary production formed during the atmospheric oxidation of highly reactive volatile organic compounds (HRVOCs) emitted from the petrochemical facilities. Smaller contributions are primary emissions from these facilities (4 +/- 2%), and secondary production (similar to 3%) and primary emissions (similar to 1%) from vehicles. The primary emissions from both sectors are well quantified by current emission inventories. Since secondary production dominates, control efforts directed at primary CH2O emissions cannot address the large majority of CH2O sources in the Houston area, although there may still be a role for such efforts. Ongoing efforts to control alkene emissions from the petrochemical facilities, as well as volatile organic compound emissions from the motor vehicle fleet, will effectively reduce the CH2O concentrations in the Houston region. We do not address other emission sectors, such as off-road mobile sources or secondary formation from biogenic hydrocarbons. Previous analyses based on correlations between ambient concentrations of CH2O and various marker species have suggested much larger primary emissions of CH2O, but those results neglect confounding effects of dilution and loss processes, and do not demonstrate the causes of the observed correlations. Similar problems must be suspected in any source apportionment analysis of secondary species based upon correlations of ambient concentrations of pollutants.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)

Keyword

carbonyls
ambient air
air-quality
stratosphere
airborne
statistical-analysis
emission inventories
nox
hydrocarbons
ozone formation

Publication and Content Type

art (subject category)
ref (subject category)

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