Abstract
WHEN the effects of air pollutants on plants were investigated, the sensitivity of the plants to ozone or irradiated automobile exhaust was found to decrease during the winter months regardless of whether the plants were grown in the greenhouse or in controlled environmental conditions. Because the degree of stomatal opening may influence the degree of injury caused by air pollutants, a year's study of daytime stomatal movements was begun. Light, temperature, atmospheric pressure, relative humidity, time of day and month of year were the parameters studied.
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