A larger pool of ozone-forming carbon compounds in urban atmospheres

A C Lewis, N Carslaw, P J Marriott, R M Kinghorn, P Morrison, A L Lee, K D Bartle, M J Pilling

Research output: Contribution to journalArticlepeer-review


Volatile organic compounds play a central role in the processes that generate both urban photochemical smog and tropospheric ozone(1,2). For successful and accurate prediction of these pollution episodes, identification of the dominant reactive species within the volatile organic carbon pool is needed(3). At present, lack of resolution inherent in single-column chromatographic analysis(4) limits such a detailed chemical characterization of the complex urban atmosphere. Here we present an improved method of peak deconvolution from double-column (orthogonal) gas chromatography(5,6). This has enabled us to isolate and classify more than 500 chemical species of volatile organic compounds in urban air, including over 100 multi-substituted monoaromatic and volatile oxygenated hydrocarbons. We suggest that previous assessments of reactive carbon species may therefore have underestimated the contribution made by volatile organic compounds to urban pollution, particularly for compounds with more than six carbon atoms. Incorporating these species in predictive models should greatly improve our understanding of photochemical ozone yields and the formation of harmful secondary organic aerosols(7,8).

Original languageEnglish
Pages (from-to)778-781
Number of pages5
Issue number6788
Publication statusPublished - 15 Jun 2000



Cite this