Locating the source of visible emissions and/or pixilation distortion on the TEPCO cams is a challenging task.
On TEPCO cam 1, emissions can often be seen emanating from the roofs of units 1 and 2 but the major source of visible emissions or distortion comes from a location that appears to be located near unit 3, perhaps behind it.
Below are two screenshots of this amorphous source of pixilation taken over the last 24 hours:
It looks to me from these comparative screenshots that there is a pixilation cloud deriving from the cranes. Here are the full screenshots and time stamps:
December 8, 2015 10:50 AM
December 9, 2015 00:25