90% of the world breathes 10,000 ltrs of toxic air daily, directly affecting the lungs and consequently every major organ system. Our lungs are a great indicator of long-term health yet we know so little about their state. Eupnoos is a smartphone first platform that enables every person to monitor their lung health and prevent long term chronic diseases via our app, the in-built microphone, voice, and breath. The data amassed by our app is available via an API as ground truth information and an additional layer into environmental pollution detection services where community and individual level impact can be measured.