NO₂ PPM Checker
Gas stoves and traffic fill indoor air with NO₂. The WHO 1-hour guideline is about 0.05 PPM (50 PPB). Convert your reading and see where you stand.
Calculator
NO₂ PPM Checker
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Gas stoves and traffic fill indoor air with NO₂. The WHO 1-hour guideline is about 0.05 PPM (50 PPB). Convert your reading and see where you stand.
How to use this calculator
- Enter NO₂ in PPB.
- Convert to PPM.
- Compare with the 0.05 PPM guideline.
The formula
Scale conversion + WHO guideline bands.
What the units mean
PPB (parts per billion) — one part per billion parts. The standard unit for trace contaminants in drinking water and environmental samples.
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
Kitchen monitor: 120 PPB = 0.12 PPM during cooking → above guideline; use the range hood.
Quick reference
| NO₂ | Status |
|---|---|
| <0.03 PPM | Good |
| 0.03–0.05 PPM | Moderate |
| >0.05 PPM | Above guideline |
1-hour guideline context.
Where you will actually use this
Indoor NO₂ from cooking is an underappreciated health issue.
- Kitchen air quality
- Traffic exposure
- Workplace checks
Mistakes that give wrong answers
- Measuring only outdoors
- Not using extraction while cooking
Key takeaways
- Formula: PPM = PPB ÷ 1,000; WHO guideline 0.05 PPM (1-hr)
- Remember: 1-hour guideline context.
- Watch out for: Measuring only outdoors
- 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 is a safe NO₂ level?
WHO suggests ~0.05 PPM (1-hour).
Do gas stoves produce NO₂?
Yes — always use the range hood.