Assertion: aromatic hydrocarbon | /r/CapableOf | concentrate on the xylene isomers
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Source sentences:
text: Presented here is a brief overview of the atmospheric composition and gas-phase chemistry of aromatic hydrocarbons concentrating mainly on benzene, toluene, the xylene isomers, and ethyl benzene, since these rank highly among the most important aromatic hydrocarbons emitted to the atmosphere.