Learn the air you breathe.
Research summaries, room-by-room guides and case stories. Written by the team, edited for brevity.
How to read PM2.5 indoors
PM2.5 readings inside a home can swing from 5 to 500 µg/m³ in minutes during cooking. Here is how to interpret the values — and what to act on.
Radon is a 90-day average problem — until you see the curve
A cassette gives you a number for a form. A continuous monitor gives you a curve to act on. The difference is which hours of the day you were exposed.
Humidity, mould and winter ventilation
Mould risk peaks in winter — when humidity stays high, surfaces stay cold and ventilation goes down. Here is what to watch in the data.
Why indoor air quality monitors need more than one sensor
Single-channel monitors give you a coloured light. Multi-channel monitors give you the diagnosis. Here is why the difference matters.
The hotel-room reset is missing one step
Ten minutes of focused ventilation between guests resets VOCs and humidity. Almost no hotel does it — and the reviews show it.
How to use air quality data with an air purifier
Air purifiers help — when they are needed. A continuous PM2.5 reading tells you when to turn them on, when to turn them off, and whether they actually work.
What to monitor in a classroom
A focused checklist of what every classroom should have continuous data on — and what to do when each channel goes amber.
Treadmill-room CO₂ — the gym signal nobody measures
Cardio rooms generate respiratory CO₂ at three times the rate of a meeting room. The ventilation design rarely accounts for it.
What to monitor in a rental property
A focused checklist of what every rental property should have continuous data on — for mould prevention, dispute evidence and Awaab's Law compliance.
Wednesday, 3 PM. The meeting-room peak nobody owns.
A 30-day office trace shows the same CO₂ peak every Wednesday afternoon. Why it happens, what it costs, and the cheapest fix.
What 30 days of CO₂ in a Year 6 classroom told us about exam season
Pre-exam revision in a closed classroom reliably runs at 1,800 ppm CO₂. The performance drop is measurable, and so is the fix.
The tenant call you should never have to take
Mould complaints arrive long after the conditions that cause them. A continuous humidity trace catches the 14-day window where you can still act for free.
Calibration is not a feature. It is a process.
Every gas sensor drifts. The right question is not "is it calibrated" but "when was it last calibrated, and how do you know it is still right."
Why CO₂ is the single strongest signal of office productivity
Cognitive performance drops 15% at 945 ppm and 50% at 1,400 ppm. Here is the evidence, the mechanism and the fix.
The £40 air monitor reads zero PM2.5 every morning. Here is why.
Cheap monitors read zero in clean rooms. They also read zero when something is genuinely wrong. The trap, in three places.
Your kitchen is probably worse than a London roadside
Indoor PM2.5 from cooking routinely eclipses urban traffic. Why it matters and what to do about it.
Bedroom CO₂ is the cheapest sleep hack you are not doing
A closed bedroom reliably doubles CO₂ overnight. Here is how to fix it without spending anything.
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