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. 2015 Jul 13;5:12064. doi: 10.1038/srep12064

Figure 2. Field observations of concentrations point to the biogenic origin of benzenoid compounds.

Figure 2

A) Gas-phase and particle phase observed benzenoids (other than toluene) at Blodgett forest during BEARPEX 2007; Methoxybenzaldehyde (particle) is oxidation product of estragole (gas). B) Concentrations of toluene above different vegetation canopies show consistent diurnal patterns with clear nocturnal accumulation when turbulence is low. The data were obtained with a range of analytical approaches, each of which is discussed in the Supplementary Methods (S2).