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Overview of the eleven measurements
Carbon Dioxide ppm The breath signal. How fresh is the air you are in? Carbon Monoxide ppm Low-level exposure, tracked over time. Particulate Matter µg/m³ See what you breathe. Down to one micrometre. Temperature & Humidity °C · %RH Comfort is a range, not a number. Barometric Pressure hPa Weather, altitude, storms — all in one number. VOC & IAQ Index index Every gas. Every particle. One honest score. Sound Level dBA The ambient floor, measured — never recorded. Ambient Light lx Your circadian signal, measured.
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 Home Kitchens, bedrooms, nurseries, basements. Envora shows you what you breathe — and tells you how to fix it, usually for free. Office & Co-work CO₂ is the single strongest environmental lever on office productivity — and the cheapest to fix. Envora gives facilities teams and founders the number to argue with. CO₂ and indoor air quality monitoring for schools Classroom CO₂ and indoor air quality evidence for better ventilation decisions, measurable cognitive lift, and the data trail governors and parents want. Labs & Clinics Envora One is precise enough for laboratories, clinics and regulated spaces, and comes with a signed calibration certificate per device ID. Studios & Gyms Hot yoga, spin, HIIT and small studios generate extreme humidity and CO₂ loads. Envora tells you how your ventilation is holding up — live, per-room, per-class. Podcasts & Studios Envora flags the HVAC hum, the fridge compressor, the neighbour's drill — and the concentration drift that flattens your delivery — before the tape picks any of it up. Landlords & Letting Continuous, timestamped indoor air quality records for every unit you manage — so damp disputes end in data, not arguments.
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 Mould & damp risk Invisible until it is not. Allergies & dust sensitivity The 40–50% RH sweet spot. Long-term toxic gas exposure What you cannot smell, Envora can. Cooking pollution Your kitchen is an industrial chimney. Sleep & bedroom air Sleep is an environmental sport. Winter dry air Heated air is parched air. Outdoor air events When the air outside is worse than inside.
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Sleep

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.

5 min read 131 words The Envora Team

Two people, a sealed bedroom, seven hours of sleep. CO₂ reliably climbs from 450 to over 2,000 ppm by morning.

2,000
ppm
Morning bedroom peak
Sealed · two occupants
900
ppm
Trickle-vent steady-state
Low-cost retrofit
£0
Cost of cracking a window
Heat penalty notwithstanding
MVHR
Long-term answer
New builds · renovations

Two people, a sealed bedroom, seven hours of sleep: CO₂ reliably climbs from 450 to over 2,000 ppm by morning. The associated drop in sleep quality has been measured in controlled studies — reduced deep sleep, more micro-arousals, groggier mornings.

It costs nothing to fix. A trickle vent or a cracked window drops the steady-state level back under 900 ppm.

How to measure. Put a sensor on your nightstand. Watch the overnight trace for three nights.

How to fix.

  • Trickle vents on the window are the most energy-efficient answer.
  • A cracked window works, at a heat cost.
  • Mechanical ventilation with heat recovery (MVHR) is the long-term answer for new builds.

The test is simple. If you wake fuzzy more often than you wake sharp, your bedroom air is probably the cheapest lever you can pull.

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If you wake fuzzy more often than you wake sharp, your bedroom air is probably the cheapest lever you can pull.

Takeaways

What to do this week.

  1. 1 Put a sensor on the nightstand for three nights — that is all you need.
  2. 2 Add a trickle vent on the bedroom window — energy-efficient fix.
  3. 3 Crack the window if you can stand the heat penalty.
  4. 4 Plan MVHR for any new build or major renovation.
  5. 5 Compare bedroom air across seasons — winter is the worst case.
Further reading on Envora
CO₂ sensor Sleep & bedroom air Home application Temperature & humidity
Go deeper

The protection guides this article touches.

Sleep & bedroom air

The most important seven hours of your day happen in the room you measure the least. CO₂ triples overnight; humidity plummets; light and sound shape every sleep cycle.

Read the guide
Keep reading

More from Envora.

CO₂

What CO₂ levels mean indoors

A practical, numerical guide to interpreting indoor CO₂ readings — outdoor baselines, occupancy effects and what good and bad look like in homes, offices and classrooms.

12 May 2026 ·6 min read
Particulates

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.

09 May 2026 ·5 min read
Bedside · 3 nights to know

Put a sensor on the nightstand.

Three nights of data tell you whether your bedroom air is what is wrecking your mornings. Envora One — CO₂, humidity, temperature, plus 8 more channels.

Buy — £249 Sleep & bedroom guide

Free UK & EU shipping · No subscription for homes.