uHoo Aura Review: Discontinued — Airthings Wave Plus Is the Best Replacement

The uHoo Aura has been discontinued and is no longer available on Amazon or through official channels. If you were considering this monitor — or already own one and need a replacement — the Airthings 2930 Wave Plus is our recommended alternative at $234.99.

While the uHoo Aura offered 11 sensors including NO2 and ozone, the Airthings Wave Plus takes a different approach: fewer sensors, but it includes radon detection, which no other monitor in this price range offers. For most households, radon is a far greater health risk than NO2 or ozone.

Why the Airthings Wave Plus Replaces the uHoo Aura

The Wave Plus fills a unique niche: it is one of the only consumer devices that combines continuous radon monitoring with standard air quality sensors. Radon is the second leading cause of lung cancer, and most homes have never been tested. Having a device that passively tracks radon levels alongside CO2 and VOCs gives you a far more complete health picture than most monitors provide.

At $234.99, it is roughly $95 less than the uHoo Aura's original price, and requires no power outlet — just two AA batteries that last up to 16 months.

Design & Setup

The Airthings Wave Plus is a circular, wall-mounted device roughly the size of a smoke detector. It mounts with a single screw or magnetic bracket and blends into most ceilings or walls without drawing attention. There is no on-device display — you check readings by waving your hand in front of the device (a color-coded LED flashes green, yellow, or red) or through the Airthings app via Bluetooth.

Setup takes about five minutes: insert batteries, mount the device, and pair it with the app. The radon sensor requires at least 7 days to produce initial readings and around 30 days for reliable long-term averages, so place it in the room where you spend the most time and leave it there.

Sensor Performance

The six sensors cover the most health-relevant indoor air metrics:

• Radon — Continuously tracks radon gas using passive diffusion. Readings stabilize over 30+ days and become increasingly accurate with time.
• CO2 — NDIR sensor tracks carbon dioxide to help you understand ventilation quality. Readings above 1000 ppm suggest the room needs fresh air.
• VOC — Detects volatile organic compounds from cleaning products, paint, furniture off-gassing, and cooking.
• Temperature and Humidity — Standard environmental sensors for comfort and mold risk assessment.
• Air Pressure — Barometric pressure can influence radon infiltration rates, making this data useful alongside the radon readings.

Based on customer reviews, the CO2 and radon sensors perform consistently and match readings from dedicated single-purpose devices. The VOC sensor provides relative trends rather than precise PPB measurements, which is typical for consumer-grade MOX sensors.

Battery Life & Maintenance

The Wave Plus runs on two standard AA batteries with an expected lifespan of up to 16 months. There are no filters to replace, no cables to manage, and no recurring subscription fees. The Airthings app is free and stores historical data so you can track trends over weeks and months.

Pros and Cons

Airthings Wave Plus vs. SAF Aranet4 Home

The SAF Aranet4 Home ($189, which has replaced the discontinued Awair Element) focuses exclusively on CO2 monitoring with industry-leading NDIR accuracy (plus or minus 50 ppm), a 2+ year battery life, and a portable e-ink display. It does not include PM2.5 or VOC sensors. If radon is a concern in your area, the Wave Plus is the clear choice. If you primarily want the most accurate CO2 monitoring in a portable form factor, the Aranet4 Home is the better pick.

The Verdict

After extensive research and analysis, here is the AirQualityNest editorial team's verdict.

For anyone who previously owned or considered the uHoo Aura, the Airthings Wave Plus offers a compelling alternative at a lower price point. You lose the NO2 and ozone sensors, but you gain radon detection — which for most homes is the single most important air quality measurement you are probably not tracking.