Here's something for you; I'm quite sure that you missed out on it because you're a foreigner...
Why do you think what you call "the Mayor's website" (I didn't follow the link, just read the text you copied) used quotes around the word atmosphère? You wouldn't need them normally for such a word in this context, there's nothing special about the way it is employed, except... that most French people with some knowledge of their classics of the French Cinéma know that next to the Canal St-Martin, there is this small hotel called Hôtel du Nord, which gave its name to a 1938 film featuring French cinema legend Arletty, and thus associated with one of the best-known French cinema lines ever (for French people that is), which goes simply as such:
« Atmosphère, atmosphère, est-ce que j’ai une gueule d’atmosphère ? ».He is absolutely right - I completely missed the allusion when I read the description here and did not include the quotes around the word "atmosphere" in my translation. Just for fun, here is a clip from the film which contains the famous line that he refers to:
Just wonderful. Thank you again, Le Chroniqueur Berliniquais, for pointing it out. :-)