gibbothegreat

I've been struggling with the same issue, and various sources came up with these resources:

 

a statement from one manufacturer basically saying it's fine, no further mitigations needed https://looksolutionsusa.com/faq-for-fog-haze-and-covid-19/

 

A report all but saying 'haze is the new vaccine' https://www.asepo.org/FogSafety

 

 

and a rather more cautious report from some safety consultants which essentially says 'it's up to you, pal, there's no obvious risk, but there isn't very much to tick the box proving there isn't very much risk...' https://www.firstoption.group/what-s-new/news-posts/fog--haze-machines-and-covid

 

 

Based on the above, we've decided to go ahead and use it.

 

 

 

Before its recent refurbishment, the Usher Hall in Edinburgh also had some plaster fall from the auditorium ceiling - luckily at a time when the hall was empty - and was netted for a fair while