Abstract
THE discovery of nitric acid in the lower stratosphere by Murcray et al.1 indicates that this molecule may play an important role in the photochemistry of the upper atmosphere2. Analysis of recent emission data (A. G., unpublished data) obtained in the 11.3 µm region shows that the HNO3 mixing ratio in the stratosphere is of the order of 10−8 (g HNO3/g air). HNO3 is of interest also owing to its significant role in the photochemical reactions of polluted urban atmospheres3.
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