That’s not how it works. .26 BAC is .26 g/100mL so it’s the exact same in Europe. A BAC of 2.6 is not possible as you’d die before ever getting to 1 . Also ‰ is literally just for one thousandths percentages.
When there's no % or ‰ anywhere, people assume its in the unit that is most commonly associated with BAC readings in their country. Which in the EU, is ‰
Your local news would say a BAC of 0.26, their local news would say a BAC of 2.6
That’s still inaccurate, sort of. I did more digging and found that Europe does use percentages for BAC, however they also use gramms/Liter. So it’s still % but one decimal place off because of L vs 100mL. Though maybe some local places in Europe use per mile to get numbers like 2.6 . Unless they specifically are talking about US BAC and converting it to EU BAC.