There have been various quotes in Trav books that the K'Kree have even more sensitive noses than the Vargr.
A while ago I designed various 'non lethal' grenades for the various major races. The K'Kree got sprayed with 'hungry predator and dead K'kree' scents to have them freak out or go catatonic, Vargr got hit by ultrasonic squealers (blows out their ears and maybe windows), Aslan with 'Aslan catnip' (causing the same effects as the LSD experiments on soldiers), Zhos with a crude psi grenade (generates a psionic shockwave causing active psi users to experience a Mack Truck to the head), etc. I couldn't work out Hivers though.
But back to dangerous chemicals - a starship would be loaded with them - molten sodium in the reactor cooling/power loops, chlorines and sulphurs from the breakdown of organics in the recycling systems, carcinogenic & mutagenic lubricants, outgassing plastics and such.
As fun as it is though, I don't think there would be many dangerous fluorine compounds on the ship. As cargo however....