No worries

Also, fentanyl can most certainly be deadly when airborne. You’d have to walk into a fresh cloud of it, but it’s possible if a large bag of it ripped open, something like that. Something that you’re unlikely to encounter, obviously.

The reports regarding first responders have largely (like 99%) been hysteria manifesting itself as physical symptoms (fainting, dizziness, etc) but there have been a few cases of FRs being legitimately exposed.

While you’re correct regarding the hysteria surrounding airborne/skin-contact fentanyl, you’re wildly incorrect about the dosages.

Funny that you mention the LD50 of mice, but not of monkeys, which is as low as 0.03mg/kg (IM/IV).

You’re talking about micrograms (mcg). Your wife didn’t receive more than 3mg. She’d very likely be dead or at least have been quite sick.