We have developed and produced a small and inexpensive balloon-type instrument for tropospheric and stratospheric measurements of the content of nitrogen dioxide in the atmosphere, the NaDA. The instrument utilizes the reaction of liquid luminol with NO 2 , which results in the emission of light in the visible spectral region, and can operate under both tropospheric and stratospheric conditions. The range of measured concentrations is ~0.1-50 ppbv; the instrument's sensitivity is ~26000 pulses/s per 1 ppbv of NO 2 at atmospheric pressure and its mass is ~1 kg. Field tests of the instrument have been performed. A height profile of the NO 2 distribution in the atmosphere was obtained.
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