Yeah this is one of the thing I miss in FSX days. I believe someone made a mod for factory smoke in outlying NYC areas. Was pretty cool visually and also told wind direction as well. It’s little stuff too like this that adds to the immersion level for sure.
As stated, once DX12 is implemented all these goodies will start flooding the add on scenery not to mention the doorway will be one for ASOBO to integrate many new visuals.