Basically any situation where the asbestos is not shedding dust or fibers into air that'll be breathed by humans is pretty safe. Contact with asbestos causes virtually no health risks; it really has to get into the lungs to do damage.
That's not a source at all. For some places with naturally occurring exposed asbestos minerals (e.g. Turkey) you do find a significantly higher incidence in specific lung cancers. That's also true for areas around mines (e.g. Canada).
It is hard to establish a mesothelioma baseline, because fibers can be found in the air everywhere at all times, but it is believed to be a specific disease caused by exposure, more or less always.
> not shedding dust or fibers into air
Which they all do, at some point in time. Even short exposure has been linked to mesothelioma and there is no safe exposure levels for any type of asbestos.
> Contact with asbestos causes virtually no health risks; it really has to get into the lungs to do damage.
This is not true. It is suspected to cause cancer and other issues upon ingestion and it does cause skin disease too.
https://www.mindat.org/photo-1146434.html
Basically any situation where the asbestos is not shedding dust or fibers into air that'll be breathed by humans is pretty safe. Contact with asbestos causes virtually no health risks; it really has to get into the lungs to do damage.