Abstract
The fluctuations of air transmittency over small time scales (20–500 s), in the presence and the absence of fog, are analyzed from different points of view: Fourier and wavelet transforms, multiscaling exponents, the multifractal spectrum and structure functions. All results indicate a multifractal structure associated with intermittency, and whose characteristics do not seem to change with the level of visibility. The origin of this multifractality, whether statistical or dynamical, cannot be established with certainty: there are however indications in favor of the presence of chaos.
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