Measured, not marketed
Hands-on reviews of air quality monitors, air purifiers & masks.
Researched, independent, and honest information on air pollution and the products meant to protect us against it. Every device is tested first-hand.
No sponsored verdicts or articles. Just a lot of testing and a genuine interest in helping you make sense of your air.
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New to a topic? These guides cover what matters before you buy, and where to go next.
01CO₂ monitors
What a good CO₂ reading looks like, NDIR versus cheaper sensors, and which monitors to trust.
Read the guide →
02Air quality monitors
PM2.5, VOCs and the rest: how the sensors work, and what they can and cannot tell you.
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03Radon monitors
Why radon matters, short versus long-term testing, and the detectors worth owning.
Read the guide →Latest from the test bench
ReadiMask Review – Still the Most Innovative Mask I’ve Used?
Over the years, many of us have become accustomed to ‘standard’ masks & respirators. Whether you regularly wear a 3M Aura, Powercom KN95, or a Kleenex KF94, nearly all of the key…
Read the review →-
Air Purifier Reviews2026.08.08Levoit Core 300 Review – Better Than the Xiaomi 4 Compact?
For the past five months, the Xiaomi Smart Air Purifier 4 Compact has been running in my office. It’s a smaller room, and the 4 Compact…
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Air Purifier Reviews2026.08.07Levoit Vital 200S-P Review: Tested, Measured and Lived With
When I was working out which air purifiers to buy for our house earlier this year, a few brand names kept coming up, and Levoit was…
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Air Quality Monitor Reviews2026.07.08IKEA Alpstuga Review: IKEA’s Most Capable Monitor Yet?
Welcome to the long-awaited IKEA Alpstuga review. And I do mean long-awaited, so before anything else, an apology for how long this article’s taken. Just finding…
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Air Quality Monitor Reviews2026.06.26Sensereo MSC-1 Review – Is Combined Smoke and CO Detection Worth the Upgrade?
Not too long ago, I reviewed the Sensereo MS-1, the first Matter-over-Thread smoke alarm on the market and a device I’d been quietly waiting for someone…
What I'm currently testing
Aeropulse A200-CO2
The first device I'm testing that uses the new SenseAir S12 CO2 sensor. With over 500 days of operation on AA batteries, is this the new best CO2 monitor for buildings?
Odak Clean Air Assistant
Perhaps the most beautiful air quality monitor I've tested, the Odak is a comprehensive indoor/portable air quality monitor that will always draw attention.
BREATHE Air Quality Monitor
An 8-in-1 air quality monitor that's affordable, has good cloud storage and app support, and an internal battery. Could this be the new affordable pick?
Sensereo MSC-1
Smoke and CO alarms have been stuck in the past for quite a while. No longer! This Matter over Thread alarm looks to be promising for anyone with a smart home.
Browse by category
Index AAir Quality Monitors
CO₂ monitors, particle monitors, radon detectors and portable meters - indoor and out!
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Index BAir Purifiers
Hands-on purifier reviews with measured PM2.5 decay curves, so you can see what each unit actually clears.
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Index CMasks & Respirators
Disposable and reusable masks and respirators, tested for fit and real-world protection against air pollution.
Browse →How I test
Every verdict here is built on hands-on testing, measured where I can (sealed-room CADR, sound, temperature and humidity against a calibrated hygrometer) and backed by third-party labs and research where I can't. Scores follow fixed, published tiers, not arbitrary rankings. See the full method on my methodology page.
Read the full methodology →Dispatch
The findings that don't make it into the reviews.
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