An iOS and MacOS application to display PurpleAir air quality sensor data on a map, in a Widget and a full application.
I created the application because I wanted a map of AQI on my iPhone home screen via an iOS 14 Widget. PurpleAir does not have a native iOS app, and none of the other air quality apps support widgets or had the same quality and breadth of data as PurpleAir.
You can download the iOS app in the App Store.
You can build the iOS and MacOS clients in XCode.
Our "server" is a two AWS Lambda functions: one that downloads the PurpleAir JSON file on a schedule, converting its verbose format to a terse Protocol Buffer format used by our clients; and another that invalidates the CloudFront CDN that serves that file to our clients.
See server/ for the two functions and the
Serverless Application Model
configuration file with which I deploy the service.
This is a personal project from Bret Taylor.
Data is exclusively from PurpleAir. I am a happy owner of multiple sensors. Buy one and contribute to the network!
The icon is from Feather Icons, modified slightly to conform to iOS aesthetics.