ppm in the typical bedroom, 38 Danish bedrooms, September to December.
Technical University of Denmark, 2022
Aranet4 HOME · No subscription
Waking up to a stuffy bedroom?
Your bedroom has a number. Ever seen it?
The heat’s on. The window’s shut. The door’s closed. By morning, the room feels stuffy. There’s one number you’ve probably never checked: the CO₂ in your bedroom.
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What you can’t see
You breathe out. The room keeps a little.
Every breath out adds a little CO₂ to the room. That’s carbon dioxide, and everyone adds some, people and pets alike.
With a door or a window open, the room swaps air with the rest of the house or the outdoors. With both shut, more of what you breathe out stays put.
You can’t see it. Aranet4 HOME can.
Flip the switch
The door debate, now with numbers.
Researchers in the Netherlands measured the CO₂ in 17 volunteers’ bedrooms. With the door or window open, the bedrooms averaged 717 ppm. With the door and the window closed, 1,150 ppm.
That’s about 60% more CO₂ with everything shut.
1,150ppmon average with the door and the window closedYellow on Aranet4 HOME
717ppmon average with the door or the window openGreen on Aranet4 HOME
ppm is just the unit CO₂ comes in, the way temperature comes in degrees. Source: Hogeschool Utrecht, 2018.
Status: asleep
Blanket: stolen
CO₂: adding a little
Head count
The dog sleeps in here too.
Everyone in a room adds CO₂ when they breathe out, people and pets alike. You, your partner, the kid who wandered in at 3 a.m., the dog who was just visiting. Everybody counts.
Nobody’s doing anything wrong. It’s just breathing.
Who’s sleeping in your room tonight?
Shut since October?
Sweater weather has a number too.
It’s cold, so the window’s shut and the heat’s on.
Researchers in Denmark measured bedrooms while people slept, in the heating season, from September to December. The typical bedroom averaged almost 1,000 ppm. The air outside usually has around 400 to 420. So the typical bedroom had more than twice the CO₂ of the air outside.
ppm in the air outside, usually.
Aranet“we are sharing a bedroom with the kids. It’s cold, we close things...”
Funny thing about stuffy
Temperature is one number. CO₂ is another.
When a room feels stuffy, you probably check the thermostat. It’s usually the only number on the wall.
The CO₂ number is commonly used as a sign of how much fresh air a room is getting.
On your wall72°FThe thermostat
On nobody’s wall?The CO₂ in your bedroom
“I thought it was all about temperature until I got one and learned that my home office climbs up to 2500 ppm.”
Your turn
Guess your bedroom’s number.
Drag the pin to where you think your bedroom lands on a night with the door and window shut.
Your guess: 1,200 ppmGot it. Here’s what other bedrooms measured.
400–420the air outside
717door or window open
almost 1,000Danish bedrooms
1,150door and window shut
4001,0001,4002,000+
Every number on this line came from somewhere else. The one that’s missing is yours.
Meet Aranet4 HOME
It fits in a pocket. It reads the room.
Aranet4 HOME is a pocket-size CO₂ monitor. It shows the CO₂, the temperature and the humidity in your room.
- See your CO₂ at a glance – no phone needed.
- Green, yellow or red tells you where the room stands.
- No cords, no Wi-Fi.
- Up to 4 years on two AA batteries.
What is the CO₂ level in your bedroom?
Right now it’s a guess. Aranet4 HOME shows you the number.
See what owners found
What you can’t see
You breathe out. The room keeps a little.
Every breath out adds a little CO₂ to the room. That’s carbon dioxide, and everyone adds some, people and pets alike.
With a door or a window open, the room swaps air with the rest of the house or the outdoors. With both shut, more of what you breathe out stays put.
You can’t see it. Aranet4 HOME can.
Flip the switch
The door debate, now with numbers.
Researchers in the Netherlands measured the CO₂ in 17 volunteers’ bedrooms. With the door or window open, the bedrooms averaged 717 ppm. With the door and the window closed, 1,150 ppm.
That’s about 60% more CO₂ with everything shut.
1,150ppmon average with the door and the window closedYellow on Aranet4 HOME
717ppmon average with the door or the window openGreen on Aranet4 HOME
ppm is just the unit CO₂ comes in, the way temperature comes in degrees. Source: Hogeschool Utrecht, 2018.
Status: asleep
Blanket: stolen
CO₂: adding a little
Head count
The dog sleeps in here too.
Everyone in a room adds CO₂ when they breathe out, people and pets alike. You, your partner, the kid who wandered in at 3 a.m., the dog who was just visiting. Everybody counts.
Nobody’s doing anything wrong. It’s just breathing.
Who’s sleeping in your room tonight?
Shut since October?
Sweater weather has a number too.
It’s cold, so the window’s shut and the heat’s on.
Researchers in Denmark measured bedrooms while people slept, in the heating season, from September to December. The typical bedroom averaged almost 1,000 ppm. The air outside usually has around 400 to 420. So the typical bedroom had more than twice the CO₂ of the air outside.
ppm in the typical bedroom, 38 Danish bedrooms, September to December.
Technical University of Denmark, 2022ppm in the air outside, usually.
Aranet“we are sharing a bedroom with the kids. It’s cold, we close things...”
Funny thing about stuffy
Temperature is one number. CO₂ is another.
When a room feels stuffy, you probably check the thermostat. It’s usually the only number on the wall.
The CO₂ number is commonly used as a sign of how much fresh air a room is getting.
On your wall72°FThe thermostat
On nobody’s wall?The CO₂ in your bedroom
“I thought it was all about temperature until I got one and learned that my home office climbs up to 2500 ppm.”
Your turn
Guess your bedroom’s number.
Drag the pin to where you think your bedroom lands on a night with the door and window shut.
Your guess: 1,200 ppmGot it. Here’s what other bedrooms measured.
400–420the air outside
717door or window open
almost 1,000Danish bedrooms
1,150door and window shut
4001,0001,4002,000+
Every number on this line came from somewhere else. The one that’s missing is yours.
Meet Aranet4 HOME
It fits in a pocket. It reads the room.
Aranet4 HOME is a pocket-size CO₂ monitor. It shows the CO₂, the temperature and the humidity in your room.
- See your CO₂ at a glance – no phone needed.
- Green, yellow or red tells you where the room stands.
- No cords, no Wi-Fi.
- Up to 4 years on two AA batteries.
