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•re par la vŽgŽtation et les sources artiÞcielles, rŽagissent avec les nox en prŽsence de lumi
volatile organic compounds (vocs), emitted into the atmosphere from vegetation and artiÞcial sources, react with nox in the presence of sunlight to form o3.

cette mŽthode permet dÕŽviter certaines des conditions artiÞcielles existant ˆ lÕintŽrieur des enceintes, mais elle est plus cožteuse.
researchers have used an extensive network of this type to monitor o3 effects on yields in the fraser valley, a highly populated area with intensive agriculture (fig.