Airborne, I disagree with you for a simple reason. First, the "nearly instant death" scenario of true anaphylactic shock is extremely rare. In fact, " is a gross exaggeration of that very rare reaction. But the reason I disagree with you is that I don't think that regulation of the bees is either necessary or sufficient to protect that allergic person. First, is the regulation necessary? No, because, first, my bees don't present a risk. They only sting defensively. Don't disturb them and you won't be stung. Also not necessary because those few who have this reaction will certainly not attract these insects to their yards with nectar plants, and bees don't wander around aimlessly. Also not necessary because there are other ways for that person to protect himself, for example, by carrying an epi-pen. And, regulation would certainly not be sufficient to protect that person. Anaphylactic shock can be brought about by wasps, also, which are much more likely to sting you. Or even by ant bites. So you'd better carry that pen anyway, hadn't you?
If a regulation is neither necessary nor sufficient, leave it off the books.
The concentration is not an issue if they do no harm. And they do no harm. Particularly since the severely allergic person can take measures to a) keep bees from visiting and b) protect their health (carry an epi-pen. wouldn't you?). Severely allergic people should do these things to protect themselves whether I have bees or not.