And my wife can't find ones small enough to fit her face properly. In her home country masks come in all sizes and shapes, in Europe there seems to be only a single size. At least every type I've looked at is the same size as all the others.

I found one with an amazing fit from China that was large enough. Then I googled the name and found out it’s listed under the fake/mislabeled category on the CDC site [0] with filtration efficiency between 8 and 94% (over 2 ten sample test runs):(

[0]: https://www.cdc.gov/niosh/npptl/respirators/testing/NonNIOSH...

3M N95 9210 should be big enough to cover anyone's face, methinks.