I would just say that I do see a very strong difference between substances that are on the list that in effect can kill humans on contact, and those that are in the air we breathe or are in foods we eat. I think that's the way the public understands it. And I think we run the risk of trivializing the word itself if we don't keep it for those things that are truly toxic in the ordinary sense. So if it's arsenic, we understand it would be toxic; if it's ammonia in the air, maybe to help public understanding a different word would be better.
