Right now it's so foggy it reminds me of London.
judy tooley
Having actually experienced real London fog back in the early 1950s, believe me it is something I never wish to see again.
Visibility was a very few feet, at times a bus driver would be unable to see the kerb from his cab and needed somebody walking along beside the bus. At night a street lamp on the opposite side of the road was a barely visible diffused glow. Nowadays in a bad fog visibility would probably be about 10 yards.
What made it so bad was that almost every home had at least 1 coal fire, water heating in the home was also usually coal fired, much of industry also used coal firing, electricity generation was by coal fired power stations, domestic gas for cooking etc was derived from coal, all the smoke from these coal fires would be trapped in the fog, making it far worse than just ordinary fog.
In a word, frightening.