they are salts, so NaCl etc, KNO3, are all "salts". Not likely you are allergic.
And given saline solutions are used for asthma attacks...........less so.
KH2PO4 is used internally for enemas, KNO3, well.......I'll let you look that one up
, K2SO4, not real bad effects.
Take a look at the vitamins, they have various salts as well.
Most things are okay, except for the nitrogen containing compounds or if you ate a lot of something, eg the traces.
I'm not suggesting you eat any of it, but the risk factor is very low at these volumes we deal with.
If you worked at a fert processing company? Yes, wear protective gear.