Air Matters - Providing real-time Air Quality Index & Allergy Pollen & Weather Data, as well as Protection Recommendations and Forecast.
Grover - Rent electronics for a month & try it before you buy.
World Air Quality Index - Air quality index for the globe
Shelf Engine - Vendors get paid for only products they sell
BreezoMeter - Health-focused Environmental Intelligence
Origin Marketplace - Power hundreds of decentralized, peer-to-peer marketplaces