Propeller Health, an Asthma tracking startup, raised $21.5 million in series C funding. They will use the new funds to expand their product portfolio, which already includes 45 programs. According to CEO David Van Sickle, Propeller would also like to expand globally. The company launch in 2010 and has been growing rapidly thanks to relationships with key healthcare partners including Dignity Health and government programs like Molina Healthcare. You can learn more about Propeller here.