Abstract
Much of the published research on the effects of air pollutants on plants suffers from a lack of understanding of the relationship between the conditions employed and naturally occurring concentrations of pollutant. Frequently lacking is information as to the effective dosages of pollutants used in laboratory studies. The importance of dosage is discussed, as is its relation to concentration and flux. It is suggested that a greater interrelationship between observations from different research workers would be achieved by the simple expedient of measuring pollutant uptake by the plants under study, rather than merely describing concentrations in the surrounding air.

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