[stox]

Anywhere around the accelerator you are going to have massive cyclotron radiation ( ie. the photons emitted when you coerce of near light speed proton out of a straight line).

In addition, at the detectors themselves, you have all sorts of radiation from the collisions. Muon, gamma, etc.

The author does pass on a good point, the biggest danger is oxygen deprivation from liquid helium, argon, and I assume Nitrogen ( though not mentioned ).

[Trumpet6]

Well no, the biggest risk is falls according to a CERN safety presentation from this year:

https://indico.cern.ch/event/383674/contribution/6/material/... (page 42)

(Handling is pretty vague though, and it was hard enough to track down this paltry statistics, so I'm glad falls won)

But oxygen deprivation is probably the biggest "exotic" hazard.