Reliable, trustworthy, real-time air quality data. ZephAir gives you reference-grade air quality information from more than 70 locations around the world. The data is collected by the U.S. Department of State and other government partners. ZephAir features non-U.S. locations and Washington, D.C. only. App features include: 1. Preferred Location(s). Select the location(s) that matter to you, so that the app opens right to the data you need most. 2. Push Notifications. Get the latest information with notifications for your preferred location(s). 3. Health Information. See recommendations on how to protect your health using the Environmental Protection Agency Air Quality Index. 4. Historical Data. See air quality data trends for the last 24 hours and last week. New data is being added consistently, so if your city is not listed, check back soon.