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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
Fogs which are mainly composed of water droplets are generally classified according to the physical process which produces saturation or near-saturation of the air.
Fog is a major travel hazard which can lead to problems of visibility when travelling.
Please note that when changing units, only forecasts and maps will be affected.