Local Haze 4+

Air quality sensor confidence


Designed for iPhone

    • 4.6 • 29 Ratings
    • Free
    • Offers In-App Purchases

iPhone Screenshots


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

In release 2.2, Local Haze subscribers now get air quality “at-a-glance” with Home Screen widgets in addition to the ability to subscribe to notifications for a sensor for significant changes in air quality.

About Local Haze

Local Haze reports air quality data from a variety of sensors including: PurpleAir, Sensor.Community, uRADMonitor, AirNow and the U.S. Department of State. 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 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 risk to health.

Add a Local Haze widget

See a snapshot of your favorite AQ sensor anytime you glance at your phone. One tap takes you to the AQ sensor details screen. Saves time and reduces scrolling or searching for specific AQ sensor data. For directions on how to add a Local Haze widget, visit this page:

Notifications in Local Haze

To set a notification, subscribers can tap on the bell icon on any PurpleAir, Sensor.Communit, uRADMonitor and AirNow sensor detail 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 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 persons with heart & lung disease, older adults and children, are 
at greater risk from the presence of ozone or particles.

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 more 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/

What’s New

Version 2.2.3

- iPhoneOS / iPadOS 17 / macOS 14 compatibility updates

Ratings and Reviews

4.6 out of 5
29 Ratings

29 Ratings

Loquat lover ,

Great and imperfect

I am happy to give Local Haze a five star review. It has more monitors that update more frequently than any other phone based air quality app. When there is a local fire and shifting winds, it tells me when to bring the kids in NOW not waiting an hour and a half like some other (generally good) apps.
The graphics are simple and the features are few, but what it does, it does very well. And here in Northern California, that is critical.


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.

nmatviko ,

Great app!

I downloaded Local Haze last week while in Lake Tahoe where the fires are happening. The app really helped me to understand the quality of the air while I was there.

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

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