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Alert and monitor air quality (AQI) from PurpleAir and US EPA (AirNow) sensors.

Airwyn lets you monitor a single public PurpleAir sensor or US EPA (AirNow) sensor. You can get ongoing silent notifications, or choose to get an audible alert when air quality index (AQI) goes up or down. This can let you make important decisions for your safety and health -- like when to go inside, and when to open or close windows.

A map gives an overview of AQI in your neighborhood, and lets you pick a PurpleAir or US EPA sensor to monitor. A simple color-coded graph shows how the air quality has changed over the last few days for your chosen sensor.

AQI conversion formulas from US EPA, LRAPA, and AQandU are supported.

Don't like ads? Airwyn Pro, available as an in-app subscription, removes all the advertising. Pro also features a home screen widget.

What's New in the Latest Version 104

Last updated on Feb 8, 2021 2021-01-26 - Fix rare crashes; prompt for Pro when adding a second sensor
2021-01-24 - Fix a crash
2021-01-21 - Track multiple sensors (Pro feature); woodsmoke conversion; get optional alerts when data is old
2020-12-28 - Introducing Airwyn Pro, with home screen widget and no ads
2020-11-29 - Fix map pinch-zooming; night mode color tweaks
2020-11-26 - Do spatial clustering on the server for much faster map performance
2020-11-19 - Small bug fixes
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