"Above ambient" means nothing... Living at higher altitudes, taking a plane trip, etc... will put you at far beyond ambient at sea level but no one talks about those being dangers.,(reply>), Ambient is a very low level of radiation and "above ambient" isn't at all a big deal unless you're living there. What a non-issue that they're making into one.,(reply>), @Wild Blunt Hickok It'd be a low pressure hazard before a radiation one several times over. Planes fly higher than Everest.,(reply>), If you lived at the altitudes planes fly at it would actually be a radiation hazard. But of course pilots and other people who work on planes aren't up there 24/7 so it's not as bad for them.