Der er desuden stadig tvivl om farerne ved asbest, f.eks. usikkerheden om kræftrisikoen ved indånding af små mængder, grænseværdier for mængder, som med sikkerhed ikke indebærer kræftrisiko, chrysotil- og amfibolasbests kræftfremkaldende virkninger.
These concern for example the effect of inhaling small doses on the risk of cancer, the limits below which one can be certain that cancer will not arise and the carcinogenic properties of various types of amphibolic asbestos or chrysothile asbestos. Then there are the many jobs in which asbestos is or has been used, jobs undertaken by small and medium-sized enterprises with inadequate personal safety equipment.