Don't remember reading that, GK, but as to specifics Davos (IC post 36) mentioned that he was removing his hazmat gear "once inside the facility" --which technically hasn't happened yet? Not sure here. (jonathonhawke?)
Juno (IC post #38) mentions wearing her hazmat + mask as she's entering the vent system.
NTensity, of course, hasn't been wearing his hazmat suit at all, but *is* wearing his gas mask ( IC post 33 and 55).
Don't know about Diggs (?). And Sovereign is up to you, of course.
Frankly, wearing a hazmat suit while inside a biotiech weapons lab makes a lot more sense to Ntensity than it does wearing one to enter a sewer/stormdrain system? (Post 33)