I think most Euro nations are known for having big noses (ie French, Italian etc.).
Actually slavic and aryan nose tends to be small.(There are exceptions but there are causes for that).
What is definitely longer are the semitic noses.They are common in Jews,Armenians and have influenced the shape of noses of mediteranean people.Nazis in Germany used with accurate results the method of measuring the nose index to spot the persons of semitic origin(Jews) who tried to pass out as Germans.The method proved simple and almost flawless.
There is no method to spot the slavic nose by measuring only nose index.You need more parameters to define it.Also nose on some Poles may look longer due to certain slavic features of splachnic cranium.Had they different facial characteristics,the same nose would look symmetric or even small.
In mediteranean countries slavic nose is interpreted as small nose and used as a rouch sign to identify possible slavic origin(in contrast to native bigger meditaranean nose due to semitic(aka arabic) local influence.