Revelation 9:2

2 And he opened the bottomless pit, and smoke arose out of the pit like the smoke of a great furnace. So the sun and the air were darkened because of the smoke of the pit.

A. The smoke must represent the pain and anguish which is located there. It is called the “smoke of their torment” in Revelation 14:11.

B. The smoke is so thick that the sun is darkened and the walking outside is like walking into a burning building.