Emission sticker Italy

I went that way a couple of weeks ago, got to window and just tell them what Euro number you are and hey presto they give you the relevant sticker.
I don’t think there are different fees for various emmision levels, just you can’t go through with anything less than Euro 3, so I suppose those giving out the stickers are well up on modern trucks and maybe they only question it when something a bit elderly goes through (truck not driver :laughing: ).