I'm not sure what's going on with the unit 1 cam but the emissions have looked quite heavy over the last several days. There has been precipitation and that always increases the steam so perhaps that explains what looks like heavy emissions.
That said, this morning looks particularly strange.
Here is a screenshot from yesterday and one from today:
Today 4/30/2017 at 2:00
Is that a smudge on the cam lens or is something ugly happening in unit 1?
I'm not sure but I'll keep an eye on it.