How thick is the thick­est fog?

BBC Earth (Asia) - - Q&a -

By def­i­ni­tion, fog has a vis­i­bil­ity of less than 1km, but it can get much thicker than that. The Met Of­fice vis­i­bil­ity scale runs down to a Cat­e­gory X fog, where vis­i­bil­ity is less than 20m. If fog gets mixed with in­dus­trial pol­lu­tion, it be­comes smog and can be thicker still. Dur­ing the Great Smog of 1952, driv­ers couldn’t see their own head­lights!

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