iPhone Screenshots


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

Local Haze reports air quality data from numerous crowdsourced sensors from PurpleAir, Luftdaten, uRADMonitor, and government sources including AirNow and the U.S. Department of State. In addition to viewing current conditions, you can also share sensor maps of air quality readings anywhere in the world.

The WHO and US EPA have guidelines for safe air quality as impacted by chemical pollutants and particulate matter (PM). 

PM that is smaller than 10 micrometers poses problems because it can get into 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.

We hope you enjoy using Local Haze!

What’s New

Version 1.5.1

- Misc. small bugfixes

Ratings and Reviews

4.5 out of 5
20 Ratings

20 Ratings


Decent Purple Air Monitor for AQI and PM Readings

I have found that while Purple Air does not have an official app, Local Haze offers a simple app to view PM 1, 2.5, and 10 data as well as AQI readings. I only wish temp and humidity were also available on the app from the Purple Air monitor.

fast_lychee ,

Please make iOS widget

Love that it shows PM 1, 2.5, 10 concentrations from PurpleAir sensors. Please make a widget that always shows the PM2.5 for a selected favorite sensor. Notifications when pollution crosses over a selectable threshold would be great also.

ottowt ,

Great app

Easy to setup and use!

I monitor the sensors where I live and also at my Dad's apartment, that way I can alert him if there's a problem in the nearby industrial area.

Highly recommended!

App Privacy

The developer, HumanLogic, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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