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
Sensereo MS-1 (& MS-1 Interlink) Review – Is a Smart Smoke Alarm Actually Worth It?
Smart home gadgets have crept into pretty much every corner of the house (at least they have in mine!), but, until recently, smoke alarms have remained stuck in the past. Most are…
Read the review →-
Air Quality Monitor Reviews2026.10.13Odak Clean Air Assistant Review – A Handcrafted Monitor for Calm Air Quality Tracking
Over the past few years, we’ve slowly seen air quality monitoring become more and more inclusive and fun as devices have attempted to introduce the issue…
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Air Quality Monitor Reviews2026.09.25Aeropulse A200-CO2 Review – Is This the Best Indoor CO2 Monitor?
If you’re a bit of an air quality nerd like me, there are occasionally new sensor releases that are very exciting. Last year, the tiny Bosch…
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Air Quality Monitor Reviews2026.09.16BREATHE Air Quality Monitor Review – A Worthy Second Generation?
One of the first air quality monitors I ever reviewed on this website was the Breathe Smart 2 by Breathe Tech. In fact, at the time,…
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Respirator Reviews2026.08.26ReadiMask 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…
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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