London's fog on October 18, characterized by visibility drops below 100 metres, marks the first significant autumn fog. The phenomenon caused travel disruptions during rush hour.
The Met Office defined fog as visibility under 1,000 metres, with severe fog impacting public visibility at below 180 metres. Surprisingly, fog contains minimal water—only about two pints from an Olympic pool.
Fog forms when moisture cools to its dew point, creating water droplets. This is akin to steam condensation observed on bathroom mirrors after a hot shower.
Haze, often mistaken for fog, consists of dry air particles and is not water-based. It's typically caused by pollution and can create vivid sunrise or sunset colors.
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