| Probably the best way would be to use a spot light with volumetric light. Put the light below the city, shining straight up, and exclude the ground from the light. Err, I can't actually remember if there was light exclusion in 9.5, come to think of it.
Another way would be to place a squashed sphere over the city and give the sphere a material with the fog channel active.
Pyrocluster would be another option.
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