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.
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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 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…
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Air Purifier Reviews2026.04.25Xiaomi Smart Air Purifier 4 Compact Review: Is The Most Affordable Xiaomi Purifier Worth Buying?
After buying the Mijia Smart Air Purifier 6 and the Xiaomi Smart Air Purifier 4 Lite, I went down a bit of a rabbit hole with…
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Air Quality Monitor Reviews2026.04.10Govee Air Quality Monitor Review – The Best Budget PM2.5 Monitor?
I’ve been reviewing air quality monitors on this site for a few years now, and one thing that still frustrates me is how most mainstream publications…
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Air Quality Monitor Reviews2026.04.06AirSpot Review – A Tiny Carbon Dioxide Monitor That Can Be Worn as a Watch!
Many of us who follow carbon dioxide monitoring have long wondered when sensors will be small enough to fit into a smartphone or smartwatch. That day…
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Air Quality Monitor Reviews2026.04.02IQAir AirVisual Outdoor Review – Real-World Testing and Accuracy Results
For quite a few years now, I’ve wanted to try the AirVisual Outdoor air quality monitor from IQAir. Unfortunately, it has never been particularly easy to…
What I'm currently testing
IKEA Alpstuga
Perhaps my most requested review. Could this $30 indoor air quality monitor prove to be a disrupter and lower the cost of entry into AQ monitoring?
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.
Provirtec Pawtent Pet Air Purifier
In a house full of cats, an air purifier designed specifically for pets is an interesting idea. However, it still needs to be performant enough for typical purification uses.
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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