Robert Galbraith/Reuters The AQI complication on an Apple Watch measures the Air Quality Index in your area.
- Your $4 can display the AQI with a complication on most watch faces.
- AQI stands for Air Quality Index, which is how the $4 and other government agencies describe the relative safety of local air quality.
- AQI is measured with a numeric scale that goes from 0 to 500, with lower numbers being safer.
- $4.
Your $4 includes a complication called AQI, which reports on the Air Quality Index for your location.
It's easy to $4 to many watch faces, so you can keep tabs on the local air quality with just a glance.
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What AQI is on an $4, and how it's measured
The Air Quality Index is a standard way of reporting air quality used by many government agencies, such as the Environmental Protection Agency in the US. It's a numeric scale that goes from 0 to 500, in which the lower the number, the better the air quality.
The EPA calculates the AQI based on five major air pollutants: ozone, particulates, carbon monoxide, sulfur dioxide, and nitrogen dioxide.
Here are the major AQI categories $4:
- 0 to 50. Air quality is considered "good," and air pollution posts "little or no risk." This is color coded green.
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The AQI complication on an Apple Watch shows that it is 39, and color coded green.
- 51 to 100. Air quality is "moderate," and "there may be a moderate health concern for a very small number of people." This is color coded yellow.
- 101 to 150. This range is "unhealthy for sensitive groups." The EPA says that individuals with lung disease, older adults, and children may be at a greater risk from exposure to ozone. Persons with heart and lung disease may be at greater risk from the presence of particles in the air. This is color coded orange.
- 151 to 200. This is "unhealthy," and everyone may experience adverse health effects. This is color coded red.
- 201 to 300. "Very unhealthy." This level would trigger a health alert. This is color coded purple.
- 301 to 500. The EPA calls this "hazardous," and considers this level an emergency. It is color coded maroon.
How to use the AQI complication on your $4
If you choose a watch face with the AQI complication, you can see the AQI number at a glance.
To get more information, tap the complication, and you'll see the AQI, the description (such as "Good" or "Moderate") and where your AQI falls on a color scale from green to maroon.
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Tap the AQI complication to see the air quality description and color spectrum.
For information on how to add an AQI complication to your watch, read our article, "$4."
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