Local Haze2.3.1 - App Store

Local Haze crowdsources outdoor air quality data from many different sources and delivers it to your iPhone and Apple Watch.

In release 2.3, as a Local Haze subscriber, you can now get air quality readings “at a glance” on your Apple Watch, widgets on your phone, and notifications for a sensor where significant changes in air quality have been detected.

About Local Haze

Local Haze reports air quality data from a variety of sensors across six continents, including AirGradient, AirNow, PurpleAir, Sensor.Community and uRADMonitor. In addition to viewing current air quality conditions, using Local Haze allows you to share sensor maps displaying air quality readings anywhere in the world.

The World Health Organization and the U.S. Environmental Protection Agency (EPA) have developed guidelines for safe air quality as impacted by chemical pollutants and particulate matter (PM). PM smaller than 10 micrometers poses problems because it can enter the bloodstream. Local Haze displays the level of smaller PM 2.5 particles, which pose the most significant health risk.

Local Haze Apple Watch app

If you have disabled Automatic App Install on your Apple Watch, you can follow these directions to manually install it: https://support.apple.com/en-ca/guide/watch/apd99e3c6a68/watchos

Local Haze Widgets

A Local Haze widget allows subscribers, at a glance, to see a snapshot of their favorite AQ sensor. A tap on the widget displays the Local Haze sensor details screen. For directions on how to add a widget, visit this page: https://localhaze.humanlogic.com/2023/07/22/adding-a-local-haze-widget/

Notifications in Local Haze

To set a notification, subscribers can tap the bell icon on the sensor details screen. Notifications will be sent to your phone when the air quality changes.

How Local Haze Displays Air Quality Data

Local Haze displays the EPA’s Air Quality Index (AQI) and a confidence rating for each sensor reading. The confidence rating is a feature that is unique to Local Haze and depends on many factors, including sensor maintenance and data freshness.

Each AQ sensor reading is displayed as a face icon according to the key below, with a badge on the lower right that represents a confidence rating:

Green Face: Air quality is Good.
Air quality is considered satisfactory, and air pollution poses little or no risk.

Yellow Face: Air quality is Moderate.
Air quality is acceptable. For some pollutants, there may 
be a moderate health concern.

Orange Face: Air quality is Unhealthy for sensitive groups.
The general public is not likely to be affected, but people with heart and lung disease, older adults, and children are at greater risk.

Red Face: Air quality is Unhealthy
Everyone may begin to experience some adverse health effects, and members of the sensitive groups may experience more serious effects.

Black face mask with respirator: Air quality is Hazardous.
Everyone may experience more serious health effects with possible emergency conditions. The entire population is likely to be affected.

Note: The source for the above AQ index classification is from Air Quality Index (AQI) Basics - EPA: https://www.airnow.gov/aqi/aqi-basics/

The confidence rating badges are:

Green badge with thumbs up: High confidence in the air sensor reading.

Yellow badge with OK sign: OK confidence in the air sensor reading.

Red badge with thumbs down: Low confidence in the air sensor reading.

We hope you enjoy using Local Haze! If you have any feedback about Local Haze please email us at localhaze@humanlogic.com or visit https://localhaze.humanlogic.com/

Version History This app has been updated by Apple to prepare for watchOS 27 compatibility. No new features are included.

- Where known, acknowledge those who contribute their sensor data to the cloud (AirGradient & AirNow) 2.3.1 07/14/2025 - Add a native Apple Watch app
- Add support for air quality sensors from AirGradient 2.3.0 06/27/2025 - Update for data source changes (uRADMonitor, US Department of State) 2.2.5 03/06/2025 - Add deep link to buy sensors from sensor details 2.2.4 04/15/2024 - iPhoneOS / iPadOS 17 / macOS 14 compatibility updates 2.2.3 11/13/2023 - add support for notifications from AirNow sensors 2.2.2 10/03/2023 - Widget bug fixes and misc. optimizations. 2.2.1 09/05/2023 - added Home Screen and Today View widget support.
- misc. bug fixes. 2.2.0 07/24/2023 - update to utilize the latest AirNow APIs
- misc. performance enhancements and bug fixes 2.1.2 01/23/2023 - Updated logo for Sensor.Community air quality sensors on sensor details screen. 2.1.1 04/13/2022 - Add support for notifications on sensors from Sensor.Community and uRADMonitor
- Add What's New experience to highlight latest functionality 2.1.0 01/03/2022 - Notifications for PurpleAir sensors. 2.0.0 11/20/2021 - Misc. small bugfixes 1.5.1 01/22/2021 AQI added to sensors screen
Refreshed welcome experience
Performance improvement 1.5.0 11/08/2020 * Enhanced sensor details screen
* Added sensors via uRADMonitor 1.4.0 04/10/2020 - Add US EPA AQI to sensor details 1.3.3 12/12/2019 - Update for AirNow changes
- Misc. bug fixes 1.3.2 11/25/2019 - Map drawing performance updates
- Misc. bug fixes 1.3.1 10/06/2019 - Add share feature for Map view. 1.3.0 07/20/2019 - Added support for sensors via luftdaten.info
- Added Favorites feature
- Map and Performance enhancements
- Bug fixes 1.2.0 01/23/2019 - Improved map display of large number of sensor sites
- Improved site search by location 1.1.0 12/03/2018 - Add simple list search support
- Fix misc. bugs including crashes 1.0.2 09/25/2018 - bug fixes 1.0.1 02/12/2018 1.0.0 01/25/2018