Carbon Monoxide PPM Checker
Carbon monoxide is odorless and kills quietly — the numbers matter enormously. 9 PPM is the long-term guideline; 35 PPM demands action; 200+ is life-threatening. Enter your reading for a clear verdict.
Calculator
Carbon Monoxide PPM Checker
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Carbon monoxide is odorless and kills quietly — the numbers matter enormously. 9 PPM is the long-term guideline; 35 PPM demands action; 200+ is life-threatening. Enter your reading for a clear verdict.
How to use this calculator
- Enter CO PPM from your detector.
- See the safety band.
- Follow evacuation guidance if high.
The formula
Bands based on widely published CO exposure guidelines.
What the units mean
PPM (parts per million) — one part of solute per million parts of the total mixture. The workhorse unit for trace concentrations in water, air, and food.
Worked example
Detector shows 70 PPM → evacuate, ventilate, call emergency services; do not re-enter.
Quick reference
| CO PPM | Status |
|---|---|
| 0–9 | Normal |
| 10–35 | Investigate |
| 35–200 | Danger — evacuate |
| 200+ | Life-threatening |
Get to fresh air first, check numbers later.
Where you will actually use this
CO poisoning symptoms (headache, dizziness) are easy to dismiss until it is too late.
- Home safety
- Workplace monitoring
- Post-incident checks
Mistakes that give wrong answers
- Assuming "a little headache" is fine
- Re-entering before the all-clear
Key takeaways
- Formula: CO safety bands by PPM exposure
- Remember: Get to fresh air first, check numbers later.
- Watch out for: Assuming "a little headache" is fine
- Next step: run your own numbers in the calculator above, then verify with a measurement — calculated values are only as good as the inputs.
Frequently asked questions
What CO PPM is dangerous?
Above 35 PPM for prolonged exposure; 200+ PPM is life-threatening.
What should I do if my CO alarm sounds?
Leave immediately, call emergency services, do not re-enter.