Just a reminder, as starting 1st January, more German cities are joining an already existing scheme to only allow entry of vehicles displaying 'Environmental Sticker', that foreign vehicles are not exempt from this requirement. Further details of which cities are involved, including how to obtain the badge prior to coming to Germany, can be found in the following website:
http://www.umwelt-plakette.de/int_england.php?SID=v92t1ng8ut63fu64mi2djmgen2
http://www.umwelt-plakette.de/int_england.php?SID=v92t1ng8ut63fu64mi2djmgen2