Air Quality Monitors
Best Air Quality Monitor for Basement (2026): Our 5 Picks Ranked
As an Amazon Associate we earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.
The AirGradient ONE leads this list: it measures PM2.5, CO2, TVOC, NOx, temperature and humidity in one unit, with a display and a color bar. If carbon monoxide readings matter, the Ring monitor tracks CO and PM2.5 over Amazon Sidewalk.
Starting out? See the main guide: Best Air Quality Monitor
Top picks at a glance
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9.8 View on Amazon -
Runner-UpRing Air Quality Monitor9.5 View on Amazon -
9.4 View on Amazon -
Also GreatAirthings 322 Wave Enhance9.3 View on Amazon -
9.2 View on Amazon
Compare the specs
Ranked on measures pm2.5, measures co2, measures vocs, ndir co2 sensor, phone app control from each listing, plus how many buyers have rated it. A dash (—) means we could not confirm that figure from the listing.
| Pick | Measures PM2.5 | Measures CO2 | Measures VOCs | NDIR CO2 sensor | Phone app control | Weight | Warranty |
|---|---|---|---|---|---|---|---|
| 1. AirGradient AirGradient ONE Indoor Air Quality Monitor | Yes | Yes | Yes | Yes | — | — | 1-year |
| 2. Ring Air Quality Monitor | Yes | — | — | — | — | — | — |
| 3. AprilAire ZAWTHCPV Smart Indoor 5-in-1 Wi-Fi Air | Yes | Yes | Yes | — | Yes | — | 3-year |
| 4. Airthings 322 Wave Enhance | — | Yes | Yes | — | — | — | — |
| 5. Temtop Advanced Air Quality Monitor for CO2 | Yes | Yes | — | — | — | — | 12-month |
AirGradient AirGradient ONE Indoor Air Quality Monitor
It measures PM2.5, CO2, TVOC, NOx, temperature and humidity in one unit with a display and a color bar.
- Measures PM2.5
- Measures CO2
- Measures VOCs
- NDIR CO2 sensor
- 1-year warranty stated
Good for
- Owners who want PM2.5, CO2, TVOC and NOx in one unit
- Users who want Home Assistant and local control
Skip it if
- You want carbon monoxide readings
- You want a battery-powered monitor
The monitor uses a SenseAir NDIR CO2 sensor, a Plantower PMS5003 laser particle sensor, a Sensirion SGP41 TVOC and NOx sensor and a Sensirion SHT40 temperature and humidity sensor. Readings show on a 1.3-inch OLED display and an 11-LED color bar. It stands on flat surfaces with included feet or mounts to a wall, and includes a 6.6 ft USB-A to USB-C cable and a US power adapter. It carries a 1-year warranty and works with Home Assistant.
Ring Air Quality Monitor
It tracks CO, PM2.5, temperature and humidity over Amazon Sidewalk with no base station required.
- Measures PM2.5
Good for
- Owners who want CO and PM2.5 readings
- Users who want Amazon Sidewalk connection without a base station
Skip it if
- You want carbon dioxide readings
- You want a certified carbon monoxide alarm
The monitor tracks temperature, CO, humidity and particulate matter (PM 2.5), with prompts when you may want to open a window, run a purifier or service appliances. It connects over Amazon Sidewalk with no base station required. It does not measure carbon dioxide or radon, and it is not a certified CO alarm or detector.
AprilAire ZAWTHCPV Smart Indoor 5-in-1 Wi-Fi Air
It measures PM2.5, VOCs, CO2, humidity and temperature with Wi-Fi and app control.
- Measures PM2.5
- Measures CO2
- Measures VOCs
- Phone app control
- 3-year warranty stated
Good for
- Owners who want app control and Wi-Fi readings
- Users who want CO2, VOC and PM2.5 in one unit
Skip it if
- You want carbon monoxide readings
- You want NOx readings
The 5-in-1 monitor measures PM2.5, VOCs, TVOC, CO2, humidity and temperature, and requires the AprilAire Healthy Air App to function. A simple color scheme gives status at a glance, and three light options cover default, always on and always off. It carries a 3-year warranty.
Airthings 322 Wave Enhance
It measures CO2, VOCs, humidity, temperature and pressure, plus noise and light, on battery power.
- Measures CO2
- Measures VOCs
Good for
- Owners who want CO2, VOC and pressure readings
- Users who want a battery-powered, cable-free unit
Skip it if
- You want PM2.5 readings
- You want Wi-Fi connection
The monitor measures CO2, VOCs, humidity, temperature and air pressure, and tracks noise and light levels over Bluetooth. The battery-powered unit needs no cable, and a touch sensor gives a color-coded indicator with full readings in the app. The box includes 2 AA batteries and a Quick Start Guide.
Temtop Advanced Air Quality Monitor for CO2
It measures CO2, PM2.5 and PM10 with an audio alarm, a TFT display and CSV data export.
- Measures PM2.5
- Measures CO2
- 12-month warranty stated
Good for
- Owners who want CO2, PM2.5 and PM10 readings
- Users who want data export in CSV format
Skip it if
- You want VOC readings
- You want NOx readings
The monitor measures CO2, PM2.5 and PM10, with temperature and humidity insights on a colorful TFT display and an audio alarm. Readings export in CSV format via USB for long-term tracking. A rechargeable battery powers the unit, and it carries a 12-month warranty.
How to choose
Match the measurements to the need
Monitors differ in what they measure. The AirGradient ONE measures PM2.5, CO2, TVOC, NOx, temperature and humidity. The AprilAire measures PM2.5, VOCs, CO2, humidity and temperature. The Temtop adds PM10 beside CO2 and PM2.5. The Ring tracks CO and PM2.5, and the Airthings tracks CO2, VOCs, humidity, temperature, pressure, noise and light. Pick the unit whose measurement set covers what you want to watch.
Check how readings reach you
The AirGradient ONE shows readings on a 1.3-inch OLED display and an 11-LED color bar, with a subscription-free dashboard and app. The AprilAire needs the AprilAire Healthy Air App to function. The Airthings sends readings to its app over Bluetooth, and the Ring connects over Amazon Sidewalk. The Temtop shows readings on a TFT display and exports them in CSV format via USB.
Power and placement
The AirGradient ONE runs on a US power adapter with a 6.6 ft cable, and stands on feet or mounts to a wall. The Airthings runs on battery power with no cable. The Temtop uses a rechargeable battery. Put the monitor where its readings reflect the room you want to watch, and keep its sensor openings clear.
FAQ
Which monitor measures PM2.5, CO2 and VOCs together?
The AirGradient ONE measures PM2.5, CO2, TVOC and NOx, and the AprilAire measures PM2.5, VOCs and CO2.
Does the Ring monitor measure carbon dioxide?
No. The Ring monitor tracks temperature, CO, humidity and PM 2.5, and it does not measure carbon dioxide or radon.
Which monitors run on battery power?
The Airthings runs on battery power with 2 AA batteries included. The Temtop uses a rechargeable battery.
Can I export readings for long-term tracking?
The Temtop exports readings in CSV format via USB. The AirGradient ONE gives free API access and a subscription-free dashboard.
