Van Life CO Safety: What PPM Level Should Scare You?

Van life CO safety comes down to one question: what number on your detector means you need to act right now? The answer is 35 PPM for extended exposure, and 70 PPM means leave immediately. Carbon monoxide — a colorless, odorless gas — is one of the biggest hidden dangers for van lifers and overlanders who cook on propane. According to the CDC, CO kills roughly 400 people in the U.S. every year and sends more than 100,000 to the emergency room. Your van is one of the highest-risk environments for CO buildup because the space is small and often sealed tight. In a converted van with the doors closed, a propane stove can push CO to dangerous levels in just a few minutes. This post will walk you through every key PPM threshold, explain what each number means for your health, and tell you exactly when to get out. Whether you're a weekend van lifer or a full-time nomad, this is the safety information you actually need.

What PPM of Carbon Monoxide Is Actually Dangerous?

PPM stands for parts per million — it's the unit used to measure how much CO is in the air around you. Normal outdoor air has about 0.1 PPM of CO. Once you start cooking or if something malfunctions, that number can climb fast. Here's how to read the scale. NIOSH — the National Institute for Occupational Safety and Health — sets 35 PPM as the maximum safe level for an 8-hour workday in open workplaces. That's with good ventilation. In a van, the same amount of CO is much more concentrated. At 70 PPM, the CPSC says you're already at the threshold where a standard CO alarm is legally required to trigger — but 70 PPM can still cause headaches within a couple of hours. At 150 PPM, symptoms can appear in under two hours for a healthy adult. At 400 PPM, you can lose consciousness and die within three hours. These aren't worst-case numbers — they're documented in the Carbon Monoxide PPM Levels Explained: What's Safe, What's Dangerous PPM reference guide based on NIOSH and CDC data. The key takeaway for van lifers: don't wait for a beeping alarm. By the time a standard detector goes off, you've already been breathing elevated CO for a while. Takeaway: Know your numbers — 35 PPM is your warning, 70 PPM is your exit cue.

Why Is a Van One of the Worst Places for CO Buildup?

Your home has hundreds of square feet and usually some airflow through walls, attics, and gaps. Your van has maybe 60 to 80 square feet — and when you insulate it well to stay warm at night, you also seal it tight against fresh air. That's a problem. Propane stoves produce CO as a byproduct of burning fuel. Even a well-adjusted burner puts out some CO. In an open kitchen, it disperses before it reaches you. In a sealed van, it has nowhere to go. The CPSC has documented cases where small fuel-burning appliances in enclosed spaces caused CO poisoning within minutes, not hours. CO doesn't rise or sink — it mixes evenly into the air you're breathing. So cracking a window at the top won't necessarily clear it faster than a window at the bottom. Sleeping in a sealed van after cooking on propane — even if you aired it out for a few minutes — is one of the most common scenarios linked to CO poisoning while sleeping. Carbon Monoxide Poisoning While Sleeping: The Real Risk The warmth makes you drowsy, symptoms feel like normal tiredness, and you drift off before you realize anything is wrong. External sources matter too. A neighbor's generator at a campsite, another vehicle idling nearby, or even a wood fire too close to your air intake can push CO inside. You won't smell it. You won't see it. You just need a detector that shows you the real number. Takeaway: A well-insulated van traps CO fast — ventilation helps, but a live reading is the only way to know you're safe.

What Happens to Your Body at Each CO Level?

CO hurts you by replacing oxygen in your blood. Your red blood cells grab CO instead of oxygen, and your organs start to starve. The scary part is that it feels like a lot of other things — a headache, a bad night's sleep, too much sun. At 35 PPM: You probably feel fine. But your body is already absorbing CO with every breath. NIOSH says this is the upper limit of safe for continuous exposure over an 8-hour period. Over a full night's sleep, that's ten-plus hours of intake. At 70 PPM: Headache can start within two to three hours. This is where standard home CO alarms first trigger, per the UL 2034 standard. Many van lifers don't realize they've been at this level all night until morning brings a pounding headache they blame on dehydration. At 150 PPM: Headache, dizziness, and disorientation within two hours. How Long Does Carbon Monoxide Poisoning Take? The Full Timeline At this level, a sleeping person may not wake up on their own. At 400 PPM: Life-threatening. Loss of consciousness within three hours. The CDC lists this as a level that can be fatal with prolonged exposure. At 150 PPM, a sleeping adult can lose consciousness before ever feeling sick — and never wake up. This is why CO is called the silent killer. It doesn't hurt going in. It just quietly takes over. Takeaway: By the time you feel symptoms, your body has already been fighting CO for a while — a live PPM reading is your only early warning.

How Can Van Lifers Protect Themselves From CO Right Now?

• Always crack a window or vent when using a propane stove — even in cold weather, two to three inches of airflow makes a real difference in how fast CO clears
• Never run a generator, gas heater, or camp stove inside a fully closed van — these are the top sources of fatal van CO poisoning according to the CDC
• Use a CO detector with a live PPM display so you can watch levels rise in real time instead of waiting for an alarm that only triggers at 70 PPM or higher
• Place your detector near your sleeping area and within a few feet of your propane stove — those are the two highest-risk zones in your van
• Check your detector's expiration date — most CO sensors expire after 5 to 7 years, and an expired sensor may not detect anything at all (see our guide on How Long Do Carbon Monoxide Detectors Last? When to Replace Yours)
• At campgrounds, park with your van's windows and vents pointing away from neighboring generators and vehicle exhausts — CO from outside sources is a real overnight risk
• If your CO detector shows any reading above 35 PPM while you're sleeping, open every door and window immediately and step outside until the number drops to zero

Van life is one of the most freeing ways to travel — but it comes with real risks that a bricks-and-mortar house doesn't have. The small space, the propane cooking, the sealed insulation, the nights parked near generators — all of it stacks up. The one thing that changes the equation is knowing your actual PPM number in real time, not just hearing a beep when things are already bad. The AirShield™ 3-in-1 Portable Carbon Monoxide Detector was built exactly for this situation. It plugs into any outlet worldwide (100–240V), shows live CO, methane, and propane levels on a bright OLED screen, and uses an electrochemical sensor with a patented Smart M8 Chip for accuracy you can trust. It's UL listed, compact enough for van life, and gives you the numbers before they become an emergency. If you're heading out this summer, it's worth having one along. You can find it at airshield.store.