At the Bowie Ice Arena, in Bowie, MD, USA, the dehumidifier needs repair.
There is a little fog, and some mold and mildew on some of the hanging penants. Drip from them is creating small colored ice stalagmites that you may want to avoid.
If you are allergic to mold or mildew, the coloration indicates there probably is some.
Probably will be fixed in a few days.
In the mean time, they have raised the air temperature a bit, turned on some heaters to reduce the problem, and are surfacing the ice between sessions.