TZOA is a new project on Kickstarter, that is hoping to raise $110,000 to fund its wearable enviro-tracker. TZOA "measures your personal air pollution and UV exposure in real-time using advanced sensor technology", according to its Kickstarter page.
It will arrive as a small round tracker that has sensors on it that keep an eye on air quality, UV light, humidity, and temperature. All of this data is fed to a companion smartphone app to quantify the environment around you. From within the app, you can find out the quality of the local air, and upload this data to a crowdsourced pollution map of your town. That last bit, is a very nice trick.
The team is still in the early stages of building TZOA, with a projection production run starting in summer 2015. A $135 pledge on their Kickstarter page will secure you one of the first TZOA sensors off the production run.