Abstract
Comparison of measurements and model calculations has shown that NO, NO 2 and O 3 concentrations in power plant plumes are very close to their equilibrium values. Measured deviations from their photostatic equilibrium values are likely to be caused by insufficient spatial resolution of the instruments used, and not (as often suggested) by the slowness of the reactions involved compared to the speed of mixing. Furthermore it is shown that, this being true, probability density functions of plume NO x concentrations can be used to calculate NO 2 concentrations. The spatial resolution of the measurements was 40 m. This resolution was obtained after applying a two-point digital deconvolution filter to the measured concentrations of NO, NO x and O 3.
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