Airthings Monitors Track Radon Alongside Indoor Air Quality

Airthings is the monitor brand to pick when radon is the reason you are testing. At The Indoor Report, we explain what each published specification means for a buying decision, and Airthings publishes range and accuracy figures for its radon sensor. That sensor design has been on sale since 2011, according to the Why Airthings page.

Airthings started in August 2008 as Corentium, founded by scientists who had worked together at CERN (the European Organization for Nuclear Research), according to the Airthings about page. The company took the Airthings name in 2016 and is headquartered in Oslo, Norway. Airthings says it has sold more than 1.5 million monitors worldwide.

Three rivals each beat Airthings on one narrow point. Ecosense gives a faster first radon reading, AirGradient publishes its hardware and firmware, and Aranet runs a carbon dioxide monitor for years on batteries. For a home where radon is a real question, an Airthings radon monitor on the lowest floor you use is our recommendation.

Which Airthings Monitor Fits Your Home

The right Airthings monitor depends on two questions: do you need radon readings, and do you want them on a phone or on a screen. Six monitors on the Airthings US store cover the common jobs as of October 2026. Pick by the job:

• Radon on a built-in screen, with no Wi-Fi needed: Corentium Home 2, $179.99.
• Radon with phone alerts over Wi-Fi: View Radon, $219.99.
• Radon plus fine particles, carbon dioxide and chemical vapors in one unit: View Plus, $329.99.
• Radon plus carbon dioxide and chemical vapors on Bluetooth: Wave Plus, $249.99.
• A bedroom or home office with no radon concern: Wave Enhance, $159.99.
• A bathroom, laundry room or garage where mold is the worry: Wave Mini, $89.99, which reads VOCs, temperature and humidity and gives a mold risk score.

Airthings says radon levels are usually highest in basements and ground floors, so the radon unit belongs on the lowest level where people spend time. A Wave Enhance can then go in a bedroom upstairs. The table lists what each model measures, as Airthings publishes it on each product page.

The Airthings Radon Sensor Sets the Brand Apart

Airthings radon monitors use a passive diffusion chamber read by alpha spectrometry, according to Airthings, and the same design runs from the $179.99 Corentium Home 2 to the $329.99 View Plus. Radon gas drifts into the chamber on its own, without a pump, and the sensor detects the alpha particles released as the radon decays. The battery models run for 1.5 to 3 years on AA cells, according to Airthings, so a monitor can sit in a basement corner with no outlet nearby.

The View Radon and View Plus product pages give a measuring range of 0 to 500 picocuries per liter (pCi/L). According to Airthings, accuracy at 5.4 pCi/L is about 10 percent after 7 days and about 5 percent after 2 months. The number gets tighter the longer the monitor runs, and a long reading is the one that matters. The Environmental Protection Agency (EPA) radon guide says a long-term test is more likely to tell you a home's year-round average than a short one.

The Airthings app colors each radon reading against three bands, according to the View Radon product page. Green covers readings below 2.7 pCi/L, yellow covers 2.7 to 4 pCi/L, and red starts at 4 pCi/L. The EPA recommends fixing a home at 4 pCi/L or higher, so the Airthings yellow band warns you before a reading reaches that action level. Our radon test kit guide covers what to do with a red result.

Airthings says the same radon sensor design is trusted by homeowners and professionals. Airthings describes its Corentium Pro as a favorite of home inspectors and radon professionals, and sells calibration services for it. A homeowner buying a Corentium Home 2 gets that sensor design at $179.99.

One Airthings App Covers Radon and Air Quality

Every Airthings monitor reports to the same free Airthings app, so radon in the basement and carbon dioxide in a bedroom show up on one screen. The app sends alerts and keeps long-term trends, and the Why Airthings page describes it as free with no paid tier mentioned. A View Plus or View Radon plugged into USB-C power also acts as a hub, which gives Bluetooth Wave monitors remote access and, according to Airthings, longer battery life.

The View Plus carries the widest sensor set Airthings makes. Its carbon dioxide (CO2) reading comes from a nondispersive infrared (NDIR) sensor with a range of 400 to 5,000 parts per million (ppm), according to Airthings. An NDIR sensor measures CO2 directly by how much infrared light the gas absorbs, so a rising number is a real signal to open a window or run ventilation. Our CO2 monitor guide explains which readings call for action.

The View Plus also measures fine particulate matter (PM2.5), and Airthings says that sensor is calibrated against a GRIMM reference instrument. PM2.5 is the reading that shows wildfire smoke and cooking smoke indoors, so the View Plus can tell you when to close windows and run a purifier. It also tracks volatile organic compounds (VOCs), the chemical vapors given off by paint, cleaners and new furniture.

The View series uses an e-ink display, and Airthings says the View Plus is Calm Tech Certified. An e-ink screen has no backlight, and the View Plus glow indicator lights on motion, so the readings stay visible without a bright screen in a dark room. The Wave Enhance adds sound and light sensors plus a daily Sleep Disruptors report, which matches its pitch as a bedroom and home office monitor.

Airthings Pricing and Warranty as of October 2026

Airthings monitors cost $89.99 to $329.99 on the Airthings US store as of October 2026, with no subscription fee listed. Bundles cut the price of a multi-room setup. Airthings lists a View Plus and View Radon pair at $467.48, down from $549.98, and a two-unit View Plus Duo at $560.98, down from $659.98.

• Standard warranty: 1 year, per the Why Airthings page.
• Extended warranty: a free 5-year warranty when you register the monitor on airthings.com within 30 days of purchase.
• Returns: a 45-day money-back guarantee on orders placed at airthings.com.
• Health accounts: Airthings lists its monitors as eligible for a Health Savings Account (HSA) or Flexible Spending Account (FSA) through Truemed, with eligibility depending on your plan.

The registered warranty changes the cost math. Spread over the 5-year registered warranty, a $329.99 View Plus costs about $66 a year, and a $179.99 Corentium Home 2 costs about $36 a year. A single charcoal radon kit gives you one short reading, while either Airthings monitor keeps reading through every season of that 5-year span.

Prices on airthings.com change with sales. Check the current figure on the View Plus product page or the Corentium Home 2 product page before you order.

How Airthings Compares With Ecosense, AirGradient and Aranet

Airthings is the only brand of these four that puts radon, PM2.5 and CO2 in one consumer monitor, based on each maker's own product page. Each rival wins one narrower contest, shown below with each maker's published specifications and prices as of October 2026.

Choose the Ecosense EcoQube when speed matters more than extra sensors. Ecosense says the $149 EcoQube shows a first radon reading in about 10 minutes, and the EcoQube is approved by the Canadian National Radon Proficiency Program (C-NRPP). The EcoQube measures radon only, needs a 2.4 GHz Wi-Fi network, and carries a 1-year warranty plus a 1-year extension with registration, against the 5-year Airthings registered warranty.

Choose the AirGradient ONE when you want to see and change the code. AirGradient sells it at $230 assembled or $138 as a kit, publishes it as fully open source, and lists its dashboard as subscription free. It measures PM2.5, CO2, total VOCs and nitrogen oxides (NOx), but it has no radon sensor, so a radon-prone home still needs a separate radon monitor. Our PurpleAir vs AirGradient comparison covers the AirGradient sensors in more depth.

Choose the Aranet4 HOME when CO2 is the only reading you want. Aranet lists an NDIR CO2 sensor, an E-Ink display, battery life of up to 4 years and no subscriptions. The Aranet4 HOME has no radon, particle or VOC sensor, so it suits a bedroom or classroom ventilation check where a Wave Enhance would also fit.

Airthings Drawbacks to Weigh Before You Buy

The biggest Airthings drawback is a slow start, because a passive chamber needs days of data before its numbers settle. The Corentium Home 2 shows its first 24-hour average after one full day, and the View Plus lists an initial calibration time of about 7 days for its VOC and CO2 sensors, according to Airthings. Treat the first week as setup time, and use an EcoQube or a charcoal kit if you need a radon number sooner.

• Bluetooth range: the Wave Plus, Wave Enhance and Corentium Home 2 sync to the app over Bluetooth, and Airthings says the Wave Enhance syncs only when your phone is within about 30 feet. Add a View Radon or View Plus on USB-C power as a hub if you want readings while you are away.
• Particles on one model only: of the six Airthings monitors in the first table, the View Plus is the only one with a PM2.5 sensor. Buy the View Plus, or pair a Wave model with a separate particle monitor, if wildfire smoke is a concern where you live.
• Wi-Fi band: the View series connects on 2.4 GHz Wi-Fi (802.11b/g/n), per Airthings. Confirm in your router settings that a 2.4 GHz network is turned on before setup.
• Wave Radon availability: Airthings lists the Wave Radon as no longer sold on airthings.com, though it remains at Amazon and other retailers. Airthings also says the first-generation Wave Radon does not work with the View hub function, so check the generation before you buy one secondhand.

Who Should Pick Something Other Than Airthings

Skip the Airthings radon models if you live in an upper-floor apartment and only want to know when a room gets stuffy. Airthings says radon is usually highest in basements and ground floors, far from an upper-floor flat. An Aranet4 HOME or the $159.99 Wave Enhance covers CO2 without paying for a radon sensor.

Skip Airthings if you are buying or selling a house next week and need a radon result now. An EcoQube gives a first reading within the hour, according to Ecosense. A lab-analyzed test from our radon test kit guide gives a documented result you can share with the other side of the sale.

Skip Airthings if you want to export raw sensor data into your own tools without a vendor app in the middle. The AirGradient ONE publishes its firmware and hardware, so you can read the sensors directly.

What Would Change Our Answer on Airthings

Our recommendation would change if a rival matched the Airthings radon sensor and its 5-year registered warranty in a monitor that also reads PM2.5 and CO2. No rival on this page does that as of October 2026. It would also change if Airthings added a paid subscription for alerts or trend history, since the free app is part of the value.

A price move matters too. An EcoQube plus an assembled AirGradient ONE costs $379 on the makers' listed prices, $49.01 more than one View Plus. If an AirGradient or Ecosense price cut reversed that gap, two devices would become the better buy for anyone who also wants open sensor data.

Our Airthings Verdict for Radon-Prone Homes

Airthings is the brand we recommend for a house with a basement or ground floor, because one sensor design covers radon from the $179.99 Corentium Home 2 to the $329.99 View Plus. Buy the Corentium Home 2 if you want radon on a screen with no app setup beyond Bluetooth. Buy the View Plus if you also want smoke, CO2 and chemical vapor readings in the same living area.

Pick the Airthings model from the first table, place it on the lowest floor you use, and register it on airthings.com within 30 days to get the free 5-year warranty.