The best air quality monitor for most homes is the Airthings View Plus, which tracks radon, particles, CO2 and VOCs in one unit and which LeafScore, a home and sustainability review site whose reviewer Dan ran it in his New York home, named its top overall pick.
If you only need CO2 or want something cheaper, there are strong alternatives. Below are four monitors over $100, what reviewers found, a budget Matter option for context, and prices checked October 21, 2026.
Best air quality monitor: picks at a glance
Prices checked on Amazon Oct 21, 2026. I may earn a commission from links, at no cost to you.
| Monitor | Price (Oct 21, 2026) | Why it fits | Link |
|---|---|---|---|
| Airthings View Plus | $329.99 | Best overall: radon, PM, CO2 and VOCs with a screen | Check price |
| Airthings Wave Plus | $249.99 | Radon, CO2 and VOCs without particles, on batteries | Check price |
| Aranet4 Home | $189 | Best CO2-only monitor, long battery life | Check price |
| Qingping Air Monitor 2 | $149.99 | Particles, CO2 and noise with MQTT for smart homes | Check price |
What an air quality monitor measures
Most home monitors track some mix of particles (PM2.5 and PM1), carbon dioxide, volatile organic compounds, humidity and temperature. Airthings models add radon, a radioactive gas from the ground that LeafScore describes as a carcinogen that can affect any property. Which sensors you need depends on your home: radon matters most in basements and ground floors, CO2 shows when a room needs fresh air, and particle readings jump with cooking and smoke.
1. Airthings View Plus: best air quality monitor overall
The Airthings View Plus measures radon, PM2.5, PM1, CO2, VOCs, humidity, temperature and pressure, according to Airthings. LeafScore’s reviewer set it up in minutes over Bluetooth and Wi-Fi. After about three days it showed first readings; the radon figure becomes more accurate after about a month. Its PM2.5 reading jumped from about 5 to 35 while he baked with an electric oven, and it sent an alert. It also revealed that CO2 in his home was consistently high in summer with the air conditioning running, something he had not known.
Wave a hand in front of it and a colored light shows whether anything needs attention; his glowed red for CO2. The home screen is customizable, and Airthings says it can run on six AA batteries for up to two years in low-power mode or plug in over USB-C. The View Plus also works as a hub for Airthings Wave monitors.
2. Airthings Wave Plus: radon and CO2 without particles
The Airthings Wave Plus covers the same gases as the View Plus, including radon, CO2 and VOCs, but drops the particle sensor and the screen, according to Airthings. It runs about 1.5 years on two AA batteries and connects over Bluetooth, or Wi-Fi through an Airthings hub such as the View Plus. It suits a second room or a basement where radon is the main concern.
3. Aranet4 Home: best CO2 monitor
The Aranet4 Home focuses on CO2, using an NDIR sensor that Aranet rates at plus or minus 30 ppm plus 3 percent, with temperature, humidity and pressure. Its e-ink screen and two AA batteries give it long battery life: Aranet estimates about a year at one-minute updates and several years at ten-minute updates. It connects over Bluetooth to Aranet’s app and to Home Assistant, but not directly to Apple Home.
4. Qingping Air Monitor 2: best for smart home data
The Qingping Air Monitor 2 measures PM2.5, PM10, CO2, a relative VOC index, noise, temperature and humidity on a touchscreen, according to Qingping. It supports MQTT reporting, and Qingping maintains a Home Assistant integration. Qingping notes its VOC reading is a relative trend rather than an absolute measurement.
Budget context: IKEA ALPSTUGA and other cheap sensors
Smart Home Solver, the YouTube channel run by Reed Kleinman, who has about 737,000 subscribers and covers practical home automation, highlighted IKEA’s roughly $30 ALPSTUGA, which tracks CO2, PM2.5, temperature and humidity and works with Matter. He notes it resets its settings and clock when unplugged and is not as precise as pricier monitors. Simon Says Home Assistant, a YouTube channel dedicated to Home Assistant tutorials, placed it beside an AirGradient monitor and saw CO2 readings match, temperature within 0.3 degrees and humidity within a few points. Other options on Amazon include the Eve Room, a Matter and Thread sensor, and the lower-cost GoveeLife H5106; neither measures radon.
How to choose the best air quality monitor
- Radon risk? Only the Airthings models here measure radon.
- Cooking and wildfire smoke? Choose a monitor with PM2.5, such as the View Plus or Qingping.
- Just ventilation? A CO2 monitor such as the Aranet4 covers it.
- Smart home? Qingping offers MQTT; Airthings and Aranet have Home Assistant integrations; IKEA uses Matter.
Best air quality monitor: specs compared
| Airthings View Plus | Airthings Wave Plus | Aranet4 Home | Qingping Air Monitor 2 | |
|---|---|---|---|---|
| Sensors | Radon, PM2.5, PM1, CO2, VOC, humidity, temperature, pressure | Radon, CO2, VOC, humidity, temperature, pressure (no PM) | CO2 (NDIR), temperature, humidity, pressure | PM2.5, PM10, CO2, eTVOC, noise, humidity, temperature |
| Display | 2.9-inch display | No screen; light ring | E-ink display | Touchscreen |
| Power | Six AA batteries or USB-C | Two AA batteries, about 1.5 years | Two AA batteries; up to several years depending on interval | Plug-in with battery |
| Connection | Wi-Fi; hub for Wave monitors | Bluetooth; Wi-Fi via an Airthings hub | Bluetooth | Wi-Fi; MQTT |
| Home Assistant | Airthings integration | Airthings Bluetooth integration | Aranet Bluetooth integration | Qingping integration via MQTT |
| Buy | Check price | Check price | Check price | Check price |
Video: LeafScore: “Airthings View Plus Review: Our Top Overall Pick for an Indoor Air Quality Monitor”. Embedded with credit; the findings are the creator’s own.
Video: Simon Says Home Assistant: “How does the IKEA Alpstuga Air Quality Sensor Stack up to more expensive options?”. Embedded with credit; the findings are the creator’s own.
Frequently Asked Questions
What is the best air quality monitor?
LeafScore named the Airthings View Plus its top overall pick because it covers radon, particles, CO2 and VOCs in one unit.
Which best air quality monitor measures radon?
Of the monitors here, the Airthings View Plus and Wave Plus measure radon.
Is a cheap air quality monitor accurate?
Simon Says Home Assistant found IKEA’s ALPSTUGA close to a pricier AirGradient monitor on CO2. Smart Home Solver says cheap sensors are less precise but acceptable for the price.
How long until an air quality monitor gives readings?
The View Plus showed first readings after about three days, and radon readings sharpen after about a month, LeafScore found.
Sources
- Amazon product listings for the products linked above, checked October 21, 2026
- Airthings View Plus and Wave Plus product pages, airthings.com
- Aranet4 HOME datasheet, aranet.com
- Qingping Air Monitor 2 specifications, qingping.co
- LeafScore: “Airthings View Plus Review: Our Top Overall Pick for an Indoor Air Quality Monitor”
- Smart Home Solver: “15 Cool Smart Home Devices You’ll Actually Want in 2026!”
- Simon Says Home Assistant: “How does the IKEA Alpstuga Air Quality Sensor Stack up to more expensive options?”
Related: Airthings View Plus Review | How to Connect an Air Quality Monitor to Home Assistant | Home Assistant Green Review
Notes and disclosure
Note: Prices come from Amazon listings (or the maker’s own store where a product is not sold on Amazon) checked on October 21, 2026. Prices change often, so check the current listing. Sensor lists, accuracy and battery figures are the manufacturers’ listed specs unless a reviewer is credited. The IKEA ALPSTUGA is not sold on Amazon and is mentioned for context only. Smart Home Solver’s ALPSTUGA segment appears in a roundup in which Roborock sponsored a separate portion. LeafScore and Simon Says Home Assistant do not say in their videos whether their units were bought or supplied. Air quality monitors are informational devices, not medical equipment; follow official guidance for radon testing and remediation. Test results and tips quoted above come from the YouTube creators credited in each section; they are their findings, not hands-on claims from me.
Affiliate Disclosure: If you purchase an item through the links on this page, I may receive a commission, at no additional cost to you. Thank you for supporting the channel.