Michael Vollmer,Infrared Thermal Imaging: Fundamentals, Research and Applications (2017,→ISBN): "Usually, dry haze refers to small particles made of dust or salt with typical sizes on the order of 0.1 μm. These particles interact with radiation mostly according to Rayleigh scattering, which favors short-wavelength scattering. If the relative humidity of the air increases above 75%–80%, these tiny aerosol particles of dry haze act as condensation nuclei, thereby producing wet haze."
