Last updated: September 2025. For more info: [email protected]
Local Haze Fact Sheet
- Local Haze is a free iPhone app, available on the Apple App Store, with an Apple Watch app available by subscription:
https://apps.apple.com/us/app/local-haze/id1278998405 - Local Haze crowdsources outdoor air quality data from a variety of sources and delivers it to your iPhone and Apple Watch.
- Local Haze reports air quality data from numerous crowdsourced sensors from PurpleAir, AirGradient, uRADMonitor, Sensor.community and government sources including AirNow. In addition to viewing current conditions, you can also share sensor maps of air quality readings anywhere in the world. In the latest versions of Local Haze, you can subscribe to notifications and add Local Haze widgets to your Home screen, and use the Apple Watch Local Haze app. Visit the App Store for more information on the latest release of Local Haze.
- The World Health Organization (WHO) and the U.S. Environmental Protection Agency (EPA) have defined guidelines for safe air quality as impacted by chemical pollutants and particulate matter (PM). PMs smaller than 10 micrometers pose problems because these particles can enter the bloodstream. Local Haze displays the level of smaller PM 2.5 particles, which pose the most significant health risks. Local Haze displays the AQI (Air Quality Index) and a confidence rating for each sensor reading. The confidence rating depends on many factors, including sensor maintenance and data freshness.
- Local Haze is an iPhone app designed and built by HumanLogic that aggregates and delivers crowdsourced air quality (AQ) sensor data in an easy-to-understand mobile user experience. The app allows consumers to search for AQ sensors by geolocation and view sensor readings in detail.
- As of 2025, Local Haze monitors over 33,000 air quality sensors across six continents, including devices by PurpleAir, AirGradient, Sensor.community, uRADMonitor, and AirNow.
- Local Haze displays sensor air quality as PM (particulate matter) readings and a “Confidence rating”. This confidence rating reflects the accuracy of the sensor data based on crowdsourced readings of sensors combined with analysis of government sensor data.
- The Confidence rating enables consumers to clearly understand the accuracy of their local AQ readings in comparison to the sensors in the surrounding geographical area.
- Local Haze is available for iPhone and Apple Watch.
- Please see the Local Haze FAQ for more information.
Media Assets
Visit the Local Haze Media Assets page
Developer Information
Local Haze is designed and developed by HumanLogic.
Contact
For more information email localhaze <at> humanlogic.com.