Oxygen is a sans-serif font. It goes well with Oswald, Quicksand, G and Museo Sans Rounded. If you're thinking about using Oxygen then try 18px for headers. Give 16px a shot for content.
People commonly tag it as food, app, list, lineup, conference, health, travel, service, video and running order. You can get it from Font Squirrel, Fonts.com, Fontspring, Google Web Fonts, MyFonts, Typekit and YouWorkForThem.