J&M

In the United States, the current, widely recognized guidance levels for maximum exposure to actors of fogs, smoke effects, hazes, and other atmospheric effects using glycol, glycerol, and mineral oil are the following:

Glycol: 40 mg/m3 peak
Glycerol: 50 mg/m3 peak
10 mg/m3 time-weighted average for an eight-hour period
Mineral oil: 25 mg/m3 peak
5 mg/m3 time-weighted average for an eight-hour period

These guidance levels were developed by ENVIRON International Corporation (ENVIRON) and the Mount Sinai School of Medicine (Mt. Sinai) to minimize the potential impact on the health of actors due to exposure to these effects. The development of these guidance levels arose from.a study conducted by ENVIRON and Mt. Sinai at the request of Actors' Equity Association (Equity) and the League of American Theaters and Producers (the League) to determine whether the use of smoke, haze, and pyrotechnics special effects in theatrical musical productions is associated with a negative health impact in actors.

The following link will lead you to the PDF of the Time and distance guidelines set by the environ Study for safe use of Theatrical Fog, Haze and Smoke for AEA:
http://www.environcorp.com/img/media/T&D_guidelines_revised_...

The following link will lead you to the PDF of Calibration Factors used by the Environ Study for safe use of Theatrical Fog, Haze and Smoke for AEA:
http://www.environcorp.com/img/media/calibration_factors_rev...

The following link will lead you to an article form Lighting Dimensions Magazine on the safety and effects of Glycol based Fogs and fog fluids:
http://www.wizardsdenspfx.com/LDFog.PDF

http://www.jmfx.net/resources/aea_fog_haze_and_smoke_information