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Clean-air shop · 8 picks

Air quality monitors for your home

Airleaf reports the air outside.

A monitor shows what gets in: whether your purifier is keeping up, and when a room shut against smog needs fresh air.

8 air monitors at a glance

Our picks

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Qingping Air Monitor 2Best overall

Qingping

Air Monitor 2

PM2.5, CO₂ and five other readings on a sharp 4-inch touch screen, with history in the Qingping+ app over Wi-Fi.

  • PM2.5, CO₂, eTVOC, temperature, humidity, noise
  • 4-inch touch screen

Its eTVOC figure shows a trend, not a measured amount, and PM10 is worked out from the same particle sensor.

$149.99at qingping.co

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Aranet Aranet4 HomeFresh-air check

Aranet

Aranet4 Home

An accurate CO₂ meter that tells you when a shut room needs fresh air: the trade-off to watch while you keep smog out.

  • NDIR CO₂ sensor, ±(30 ppm + 3%)
  • Runs for years on two AA batteries

It doesn't measure particles (PM2.5).

$189.00at aranet.com

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Airthings View PlusRadon too

Airthings

View Plus

Seven sensors including radon, the radioactive gas from the ground that the US EPA names as the second leading cause of lung cancer.

  • Radon, PM2.5, CO₂ and VOCs in one
  • Battery or USB power

$329.99at airthings.com

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IQAir AirVisual ProIndoor vs outdoor

IQAir

AirVisual Pro

A PM2.5 and CO₂ monitor whose screen also shows the nearest outdoor station's reading, so you can see whether to open the windows.

  • Laser PM2.5 sensor and CO₂
  • Outdoor reading and forecast on screen

$329.99at iqair.com

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Qingping Air Monitor LiteApple Home

Qingping

Air Monitor Lite

PM2.5 and CO₂ in a small monitor that works with Apple Home, so a bad reading can switch on a purifier through an automation.

  • PM2.5, PM10 and CO₂
  • Apple Home (HomeKit) compatible

Remote access and automations need an Apple home hub (HomePod or Apple TV), and Apple Home's CO₂ trigger is fixed at 2,000 ppm.

$76.00at qingping.co

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Temtop M2000 (2nd gen)Handheld

Temtop

M2000 (2nd gen)

A handheld meter for PM2.5, PM10, CO₂ and formaldehyde, with data logging and export: for checking room by room, or new furniture.

  • NDIR CO₂ and formaldehyde
  • Logs months of data, USB export

The M2000C 2nd is a similar model without formaldehyde. Check the name on the listing.

$209.99at temtopus.com · sale price, was $229.99

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Buying guide

What to look for

01

PM2.5 for smog

Fine particles drive the AQI on most bad-air days. A laser particle sensor reads them in real time, so you can see a purifier pull the number down.

02

CO₂ for fresh air

Shut windows let the CO₂ we breathe out build up, and the room turns stuffy. An NDIR sensor tells you when to air the room. Do it at the cleanest hour of the day.

03

Trends over exact figures

Home sensors are good at showing change: up when someone cooks, down when the purifier runs. Treat an exact reading as approximate.

Buying guides

Questions

Do I need an indoor air quality monitor?
If you run a purifier or keep windows shut against smog, a monitor shows whether it's working: PM2.5 for particles, CO₂ for when the room needs fresh air.
What should an indoor air monitor measure?
PM2.5 for smoke and smog, and CO₂ (with an NDIR sensor) for ventilation. Temperature and humidity come with nearly all of them.
Where should I put an air quality monitor?
At breathing height in the room you use most, away from windows, the kitchen stove and the purifier's outlet, which would skew the reading.

Head to head

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