The emissions have been quite thick recently. It is difficult to determine all of the sources. TEPCO cam 1 view indicates emissions from unit 2 and, more prolifically, units 3 and/or 4.
The seeming "thickness" of the emissions can be discerned by the distortion of the crane behind the main flow visible below in screenshots from 2/22 at 1:24 AM and 2/22 2:51 AM