We need an easily recognizable accessibility symbol for non-toxic, wireless, VOC, scent, and fragrance-free places that show they are accessible to people with MCS/ES, asthma, COPD, migraines, and others who need healthy environments in order to remain functional and not become physically or cognitively impaired.
These signs would be used only in places that actually enforce the policies.
The standard accessibility signs have white symbols on blue backgrounds like these:
I’ve never seen anything like this to signify healthy wireless, scent, and fragrance-free indoor air, but these are some others I have found or assembled that might give a designer ideas to run with:
Seriously "Sensitive" to Pollution 