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Rethinking organic aerosols: semivolatile emissions and photochemical aging.
- Source :
-
Science (New York, N.Y.) [Science] 2007 Mar 02; Vol. 315 (5816), pp. 1259-62. - Publication Year :
- 2007
-
Abstract
- Most primary organic-particulate emissions are semivolatile; thus, they partially evaporate with atmospheric dilution, creating substantial amounts of low-volatility gas-phase material. Laboratory experiments show that photo-oxidation of diesel emissions rapidly generates organic aerosol, greatly exceeding the contribution from known secondary organic-aerosol precursors. We attribute this unexplained secondary organic-aerosol production to the oxidation of low-volatility gas-phase species. Accounting for partitioning and photochemical processing of primary emissions creates a more regionally distributed aerosol and brings model predictions into better agreement with observations. Controlling organic particulate-matter concentrations will require substantial changes in the approaches that are currently used to measure and regulate emissions.
Details
- Language :
- English
- ISSN :
- 1095-9203
- Volume :
- 315
- Issue :
- 5816
- Database :
- MEDLINE
- Journal :
- Science (New York, N.Y.)
- Publication Type :
- Academic Journal
- Accession number :
- 17332409
- Full Text :
- https://doi.org/10.1126/science.1133061