Local Haze 4+

Air quality sensor confidence


Designed for iPhone

    • 4.6 • 27 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.

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.

Notifications: New subscription feature in version 2.1 of Local Haze!

Now you can subscribe to receive a notification when there is a significant change in the air quality readings for sensors by PurpleAir, Sensor.Community and uRADMonitor. To set a notification, tap on the bell icon on any PurpleAir sensor detail screen. Notifications will be sent to your phone when the air quality changes.

Terms of Use: https://localhaze.humanlogic.com/tou
Privacy Policy: https://localhaze.humanlogic.com/privacy

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 Air Quality Index (AQI) Basics - EPA

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 2.1.2

- update to utilize the latest AirNow APIs
- misc. performance enhancements and bug fixes

Ratings and Reviews

4.6 out of 5
27 Ratings

27 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.

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.

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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