So about ionising radiation: UNSCEAR recommendation is to act as if no threshold effect exist at low doses for indeterministic effects (even though effectively we act as if a 100mSv threshold exists), but the medical literature isn't as clear cut. Precautionary principle should be respected in any cases.
The most recent epidemiology studies (studies on _very_ large cohort) do seems to favour a linear model without threshold (or, if the threshold exists, it is so low ambient radiation is enough to go past it), so I think you're right, but I wanted to nitpick because you wrote it like it was settled science and it's not yet, so I had to look up the PM 2.5 stuff too.
The most recent epidemiology studies (studies on _very_ large cohort) do seems to favour a linear model without threshold (or, if the threshold exists, it is so low ambient radiation is enough to go past it), so I think you're right, but I wanted to nitpick because you wrote it like it was settled science and it's not yet, so I had to look up the PM 2.5 stuff too.