Abstract
Two techniques designed for measurements of NOx (NO + NO2) were intercompared during aircraft flights made in the spring of 1984 in the middle free troposphere over the eastern Pacific Ocean and southwestern United States. One NO chemiluminescence instrument was equipped with a ferrous sulphate converter, another with a photolytic converter. The ferrous sulphate‐equipped instrument was apparently much less specific for NO2. It registered levels about 3 times larger than the photolytic converter and gave NO2/NO ratios that were much larger than photochemical calculations would indicate as reasonable. Additionally, the results imply that active NOx was only 10–20% of total odd nitrogen in the middle free troposphere.
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