CO₂ Breathing Emission Calculator
Calculate carbon dioxide buildup from human breathing in indoor spaces
Room CO₂ Concentration Calculator
Room Settings
Occupancy & Activity
Environmental Conditions
Room Dimensions
CO₂ Concentration Results
Final CO₂ Level
Safety Level
📊 Calculation Details
💡 Improvement Recommendations
- • Open windows for 10-15 minutes to bring fresh air
- • Increase ventilation rate (ACH) if possible
- • Take breaks in well-ventilated areas
- • Consider installing mechanical ventilation
🌱 Environmental Context
Each person produces approximately 21.0 L of CO₂ per hour during rest activity. Over 8 hours, this totals 0.17 m³ of CO₂ from all occupants.
Fresh Air Needed: 10307.7 m³ of outdoor air would be needed to dilute this CO₂ to outdoor levels.
Health Effects of CO₂ Exposure
| CO₂ Level | PPM Range | Health Effects |
|---|---|---|
| ✅ Excellent | < 1,000 PPM | No health concerns, optimal cognitive function |
| 😊 Acceptable | 1,000 - 5,000 PPM | Permissible exposure limit, possible mild drowsiness |
| ⚠️ Moderate | 5,000 - 15,000 PPM | Typically no effects, possible drowsiness |
| 😷 Poor | 15,000 - 30,000 PPM | Mild respiratory stimulation for some people |
| ⛔ Unhealthy | 30,000 - 40,000 PPM | Moderate respiratory stimulation, increased heart rate |
| 🚨 Dangerous | > 40,000 PPM | Immediately dangerous to life or health |
🧠 Cognitive Effects
Research shows that CO₂ levels above 1,000 PPM can reduce cognitive function, decision-making ability, and concentration. Even moderate increases can affect learning and productivity in classrooms and offices.
💨 Why Ventilation Matters
Proper ventilation not only removes CO₂ but also provides oxygen and removes other indoor pollutants. The recommended ventilation rate for offices is 20-40 CFM per person, while homes typically need 0.35 air changes per hour.
How to Reduce CO₂ Levels
🌬️ Immediate Solutions
- • Open windows and doors for cross-ventilation
- • Use exhaust fans in kitchens and bathrooms
- • Take regular breaks in well-ventilated areas
- • Avoid overcrowding in small spaces
- • Turn on ceiling fans to improve air circulation
🔧 Long-term Solutions
- • Install mechanical ventilation systems
- • Use air purifiers with CO₂ sensors
- • Add houseplants (though limited effectiveness)
- • Improve building insulation with proper air sealing
- • Consider heat recovery ventilators (HRV/ERV)
🌱 Natural Solutions
While houseplants do absorb CO₂ through photosynthesis, you would need hundreds of plants to make a significant difference in a typical room. The most effective solution is proper mechanical ventilation or natural airflow through windows and doors.
CO₂ Level Reference
CO₂ Production by Activity
Typical Ventilation Rates
How This Calculator Works
Calculation Methodology
This calculator uses established physiological data on human CO₂ production rates based on activity level, combined with ventilation engineering principles. The calculation considers:
- • CO₂ generation rate per person based on metabolic activity
- • Room volume and air exchange rate (ACH)
- • Initial CO₂ concentration (outdoor or previously occupied)
- • Time-dependent accumulation with ventilation dilution
Scientific Basis
CO₂ production rates are based on metabolic studies showing that humans exhale approximately 4% CO₂ (compared to 0.04% in ambient air). The calculator uses established ASHRAE ventilation standards and indoor air quality guidelines.
Health Standards Reference
The health effect thresholds are based on:
- • OSHA Permissible Exposure Limits (PEL)
- • NIOSH Recommended Exposure Limits (REL)
- • WHO Indoor Air Quality Guidelines
- • Peer-reviewed research on cognitive effects
Limitations
Results are estimates based on average values. Actual CO₂ levels may vary due to individual differences in metabolism, exact ventilation rates, air leakage, and other environmental factors. This tool is for educational purposes and general awareness.
Disclaimer: This calculator provides estimates for educational purposes. Actual CO₂ levels may vary significantly based on individual factors, exact ventilation rates, building characteristics, and environmental conditions. For critical applications or health concerns, use professional CO₂ monitoring equipment and consult with indoor air quality specialists.
Last Updated: September 2024