Abstract
Three tobacco varieties, differentially susceptible to ozone, were exposed outdoors 32 km west of central London, during the summer of 1972. At the same time the atmosphere was continuously monitored for ozone. Extensive damage appeared on the leaves of the sensitive variety (Bel-W3), but little or no damage was observed on the two more resistant varieties (Bel-B and Bel-C). The injury resembled that reported elsewhere for ozone on tobacco, and the amount of damage appearing in a given period was significantly positively correlated with the number of hours during the time that the ozone concentration exceeded the maximum natural level. It is concluded that the Bel-W3 tobacco variety is suitable for use as an indicator of low levels of atmospheric ozone under British conditions. The possibility of ozone damage occurring on crops in Britain is discussed.
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