How to Read an Airthings Radon Detector

On this page (8 sections)

1. How do you read the number on an Airthings radon detector?
2. What do the short and long averages mean?
3. What display indicators should you check?
4. What should you do if the reading is raised?
5. Which Airthings readings can you compare?
6. How accurate is an Airthings reading?
7. How do you get a useful long-term reading?
8. How should you read an Airthings radon detector overall?

To read an Airthings radon detector, check the measurement unit and averaging period beside the number. The short average reflects recent readings, while the long average gives a broader view; compare the result with local guidance before deciding whether to test further.

A radon monitor reports concentration, not a guaranteed prediction of every room or future day. Radon levels can change, so one reading is a snapshot of the conditions measured by that device.

How do you read the number on an Airthings radon detector?

An Airthings reading is a radon concentration, and the unit tells you how that concentration is expressed. The Corentium Home 223 is identified as a pCi/L model, while other devices or settings may use a different unit.

Look at the display label or app setting before comparing a number with a testing threshold. A value in pCi/L and a value in Bq/m³ are different scales, so don't compare the digits directly.

A detector measures the air near where it is placed. It doesn't mean every room has the same concentration, which is why placement and the device instructions matter.

If you're deciding whether a digital monitor fits your needs, start with what a radon detector is. That guide explains what these devices measure and how home detectors fit into radon checks.

What do the short and long averages mean?

The short average tracks a more recent period, while the long average reflects readings gathered over a longer span. Airthings Corentium Home displays daily, weekly, and long-term averages, giving you more than one time window to review.

Use the shorter average to notice recent movement, such as a rise after a change in conditions. Use the long average to understand the overall pattern, since short-term readings can move up or down.

Don't treat the short average as a final verdict. If the detector is new or has been moved, allow it to collect readings as directed in its manual before drawing conclusions from averages.

Why might two averages show different numbers?

Two averages can differ because they include different sets of readings. A recent change can shift the short average sooner, while older measurements still influence the long average.

A lower short average doesn't erase an earlier higher period, and a high short average doesn't by itself describe the long-term pattern. Read both values with their time windows in mind.

What display indicators should you check?

Check the unit, average label, and any status or error indicator before interpreting a number. The exact display varies by model, so use the device's manual for indicator meanings rather than guessing from an icon alone.

A blinking or unusual symbol may signal an operating state, low battery, or an error, depending on the model. If the device shows an error, see Airthings Corentium Home error codes and match the code to the instructions for your detector.

If the display seems stuck or confusing, review the steps for how to reset an Airthings radon detector. Resetting may affect stored readings, so follow the model-specific directions and save any information you need first.

What should you do if the reading is raised?

If an Airthings reading is raised, confirm the unit and averaging period, then follow local radon testing guidance. A single number is a reason to pay attention, but the right next step depends on the result, the test duration, and the guidance where you live.

Keep the detector in the recommended location and avoid moving it while you are collecting a measurement. If you need to confirm a concerning result, consider a separate test or consult a qualified radon professional.

A First Alert Radon Gas Test Kit is a mail-in option for an initial screening; it includes test materials and lab fees, with New Jersey state fees excluded. Results are emailed within 72 hours of lab receipt.

The kit is recommended for use only within the United States. Follow its directions for placement, test duration, and mailing the sample.

Which Airthings readings can you compare?

Compare readings from the same unit, device, and averaging period when you want to see whether conditions have changed. Comparing a daily average with a long-term average, or readings from devices in different locations, can give a misleading impression.

The Corentium Home 223 shows short and long readings on screen and is battery powered, so it can be moved between rooms. If you move it, record the location and allow readings to build there according to its instructions.

For a broader indoor air view, the Airthings 2930 Wave Plus measures radon along with carbon dioxide, humidity, temperature, and air pressure. The Airthings View radon monitor is another model to compare.

It provides a color-coded visual indication when you wave in front of it, with detailed insights available through the Airthings app.

A multi-sensor display gives context about indoor air, but the other measurements don't explain or replace a radon result. Review radon figures on their own and follow the device's directions.

How accurate is an Airthings reading?

Accuracy depends on the device, its placement, how long it has measured, and the conditions around it. Read averages as estimates of measured conditions, not exact values that apply to every room or day.

For a fuller explanation of measurement limits, see how accurate an Airthings radon detector is. That article can help you decide how much weight to give a reading and when confirmation may be useful.

For setup and placement, follow how to use an Airthings radon detector. Correct setup makes it easier to interpret readings over time.

How do you get a useful long-term reading?

A useful long-term reading comes from leaving the detector in its recommended location and allowing it to measure over time. Avoid comparing values from different rooms as if they were one continuous record.

If you are considering a device, our guide to the best Airthings radon detector compares options for different monitoring needs. Choose based on whether you want radon readings alone or a wider indoor air picture.

A Corentium Pro is intended for professional measurement work, and calibration procedures are model-specific. See Airthings Corentium Pro calibration for that model's calibration guidance.

How should you read an Airthings radon detector overall?

When you read an Airthings radon detector, start with the unit, then compare the short and long averages. Use the longer average for the broader pattern, while treating a short-term change as a prompt to keep monitoring or follow local testing guidance.

Choose the Corentium Home if on-screen short and long radon readings suit your needs. Choose Wave Plus if you also want readings for other indoor air factors, and consider a mail-in kit when you want a separate initial screening.

Frequently asked questions

What does the number on an Airthings radon detector mean?

The number is a radon concentration reading, shown in the unit configured for that device or model. Check whether the screen says pCi/L or another unit, then note whether the number is a short-term or long-term average.

Compare results with the action guidance for your location.

Should I use the short-term or long-term Airthings reading?

Use the short-term average to see recent changes and the long-term average to understand the broader pattern. Radon can vary over time, so one short reading may not represent your home's usual level.

Follow the device instructions and local testing guidance when deciding what to do next.

Why does my Airthings detector show different averages?

Short and long averages cover different periods, so they can differ when radon levels change or when the detector has only been measuring for a short time. Keep the device in its recommended location and allow readings to build.

Check its manual if a display indicator or number seems unusual.

Do I need a second radon test if an Airthings reading is high?

A high reading deserves follow-up using the testing guidance for your location. Review the device instructions, confirm the measurement unit and averaging period, and consider a second test or a qualified radon professional.

Don't dismiss a concerning result because a shorter or later average is lower.