The idea here is the same you've seen time and again in Futurama and other flights of fancy. The internet can only give us so much, because we can only experience it visually and aurally. Now, we can experience it through scent as well. Google has developed an "Aromabase" filled with over 15 million "scentibytes" of data.
Of course, just to avoid any unwanted results, SafeSearch is enabled by default for Google Nose (a very good idea, we must say). You can even find it integrated around Google with Street Scent, Android Ambient Odor Detection, YouTube Nosed Captions, and AdScent for Business.
source: Google Nose