When does the icon "haze" appear?

could anyboy let me know, when the icon “haze” appears and how it is definated in the program.

thanks.

roman

temperature above 13.5oC, humidity 99% or higher, and no rain

The definition for haze says, that haze appears over 80 % humidity.
Is it possible, setting the 99 % to another one?

cheers
roman

We have