The haze is supernatural, visible to those with the sight only it obscures the resonance outside the tents and attractions making the exposed night air harder to discern Skye however taking an interest in this sees that it seems to eliminate from the chamber of horrors tent a dark miasma of occluding resonance that centres on that location.
Heading after the workers going on some kind break can be done in a few ways, dex+stealth if you wish to remain unseen, or manipulation+subterfuge if you don't mind being seen but want to enact a form of deception regarding your presence in less public areas