I hadn't seen/read anything about that, in the UK right? - off to Google it...
Last year we found out that several cities on the continent e.g Antwerp had implemented low emission zones (LEZ) to restrict traffic. We easily managed to register the big 3.5l Hybrid and get an exemption, which seems bonkers.
Oh and yes, it made me especially as I bought the Lexus after selling my 2.2 derv which wouldn't be allowed there.