I am hard pressed to find this data regarding use in hospitals.
That hospitals use PG for air sanitation is Like the myth of Propylene glycol usage in asthma inhalers.
Then you didn't really look at the EPA document I cited. It is a "
Reregistration Eligibility Decision" issued in 2006 (because PG had been approved and in common use for air sanitation for decades before laws enacted in the 80's and 90's required review and reapproval of such uses).
"ABSTRACT
The Environmental Protection Agency (EPA or the Agency) has completed the human
health and environmental risk assessments for propylene glycol and dipropylene glycol and is
issuing its risk management decision and tolerance reassessment. The risk assessments, which
are summarized below, are based on the review of the required target database supporting the use
patterns of currently registered products. As a result of this review, EPA has determined that
products containing propylene glycol and dipropylene glycol alone are eligible for reregistration.
Products containing propylene glycol and dipropylene glycol in combination with other active
ingredients will be reregistered only when all of the active ingredients have been determined to
be eligible for reregistration. That decision is discussed fully in this document.
******
A. Regulatory History
Propylene glycol and dipropylene glycol were first registered in 1950 and 1959, respectively, by the FDA for use in hospitals as air disinfectants.
******
C. Use Profile
1. Propylene Glycol
The following is information on the currently registered uses of propylene glycol products and
an overview of use sites and application methods. A detailed table of the uses of propylene
glycol eligible for reregistration is contained in Appendix A.
Type of Pesticide: Bacteriostat, Fungistat
Summary of Use Sites:
Indoor Non-Food:
Propylene glycol is used on the following use sites:
air treatment (eating
establishments,
hospital, commercial, institutional, household, bathroom,
transportational facilities);
medical premises and equipment, commercial,
institutional and industrial premises and equipment; laundry equipment;
hard non-porous surface treatments (bathroom facilities); automobiles; air
conditioning filters; pet treatment, including cats, dogs, and caged birds;
environmental inanimate hard surfaces; garbage containers/storage."