Carbon dioxide (CO2) is a naturally occurring gas that is crucial to life on Earth. So, how to lower CO2 Level. However, high level of CO2 can negatively affect air quality, health, and comfort at your home and work place. CO2 accumulation has become a new concern because modern homes becoming more airtight to conserve energy,
In this comprehensive guide, we’ll discuss the following:
- What CO2 indoor levels are considered healthy
- How to understand CO2 numbers
- What happens when CO2 level is elevated
- 12 best ways to lower CO2 levels in your home and business
Let’s go.
What CO2 Indoor Level Is Healthy?
Indoor CO2 levels are typically measured in parts per million (ppm). Average outdoor air contains approximately 400-420 ppm of CO2. Here’s a quick breakdown of CO2 levels:
| CO2 Level (ppm) | Description |
| 400–600 ppm | Fresh air, safe and healthy |
| 600–1,000 ppm | Normal for occupied rooms |
| 1,000–2,000 ppm | Poor air quality, possible drowsiness |
| 2,000–5,000 ppm | Headaches, fatigue, impaired thinking |
| >5,000 ppm | Dangerous, potential health risk |
Indoor CO2 levels below 1,000 ppm is ideal for comfort and health, especially in spaces where people spend long periods such as bedrooms, offices, and classrooms.
Let’s Better Understand CO2 Numbers:
1. CO₂ Sources
Human breathing is the primary indoor source of CO₂. Each person exhales roughly 2.3 pounds of CO₂ per day. Additional sources include:
- Gas stoves and ovens
- Dryer, HVAC furnace
- Fireplaces and wood stoves
- Cigarettes and incense
- Pets and plants (in poorly ventilated rooms)
2. Room Size and Occupancy
Small rooms with more occupants are accumulating CO₂ faster, especially with poore ventilation. Bedrooms, home offices, and small apartments are commonly having higher CO2 level.
3. HVAC Efficiency
Dirty or poorly maintained Dryer machine, HVAC systems, failed ventilation contributes to higher CO₂ levels.
What Happens If CO₂ Level Get too High?
Exposure to elevated CO₂ levels can cause a range of symptoms, especially in enclosed spaces over extended periods; factors are concentration and duration of exposure.
Low to Moderate Levels (1,000–2,000 ppm):
- Fatigue
- Drowsiness
- Decreased concentration
- Headaches
High Levels (2,000–5,000 ppm):
- Dizziness
- Nausea
- Confusion
- Increased heart rate
- Shortness of breath
Extremely High Levels (>5,000 ppm):
- Impaired judgment
- Unconsciousness
- Potential fatality if exposure continues
Vulnerable groups such as children, the elderly, and individuals with respiratory conditions are more susceptible to these effects.
12 Ways to Control and How to Lower CO2 Level in the Home and Business
1. Don’t Smoke Inside
Cigarette smoke significantly increases CO₂ levels and releases harmful chemicals into the air. Strict none smoking rule shall be implemented.
2. Improve Ventilation
Improving ventilation is the most effective and natural way to reduce CO₂ level. Open windows and doors to let fresh air in. Use cross-ventilation by opening windows on opposite sides of a room. Use exhaust fans in kitchens and bathrooms.
3. Clean Ductwork, Regular professional air cleaning to reduce CO2 and dryer vent cleaning to reduce CO2 every 1–3 Years
Dust, lint, mold, and debris can accumulate in air ducts, impeding airflow and reducing the efficiency of ventilation systems. Regular professional air cleaning to reduce CO2 and dryer vent cleaning to reduce CO2 every 1 to 3 years helps keep your system running efficiently and improves air quality.
4. Replace Air Filters Periodically
Dirty filters in HVAC systems restrict airflow, replace filters every 1 to 3 months depending on usage, pets, and indoor air quality. Use MERV-rated filters for enhanced filtration.
5. Reduce the Use of Gas or Wood Stove
Combustion from heating and cooking appliances release CO₂ and other pollutants. Use electric appliances if possible. Ensure the kitchen is well ventilated with range hood, ceiling fan or opened window.
6. Schedule Professional Chimney Sweep and Inspection
A blocked or dirty chimney can cause high CO₂ and other gases to be trapped indoors. Schedule annual Professional Chimney Sweep and Inspection to ensure safe ventilation of combustion byproducts.
7. Professional carpet cleaning and professional rug cleaning
Dust and debris in carpets can contribute to poor air circulation and indoor air pollution. Call for Professional carpet cleaning and professional rug cleaning.
8. Go All-Natural
Artificial air fresheners, cleaning sprays, and chemical based products emit volatile organic compounds (VOCs) that interact with CO₂ levels. Use natural alternatives like vinegar, baking soda, lemon, and essential oil.
9. Use an Air Purifier with a CO₂ Sensor
While most air purifiers do not remove CO₂ directly, models equipped with CO₂ and VOC sensors can monitor air quality and activate ventilation functions.
10. Keep Windows Open in Your Bedroom
Bedrooms often have the highest overnight CO₂ levels due to continuous exhalation and limited airflow. Open windows slightly at night to allow for air exchange. If noise or temperature is an issue, use window fans.
11. Schedule Regular HVAC Maintenance
Regular inspections and tune-ups keep your HVAC system operating efficiently. This includes checking for blockages, refrigerant levels, filter replacements, and system calibration. Annual maintenance ensures optimal air exchange and indoor air quality.
12. Install Smart Air Quality Monitors
Smart devices like the Awair, Airthings, or uHoo₂, humidity, temperature, VOCs, and more. These monitors provide real time feedback and help you make data driven decision to maintain healthy air and CO2 level by EPA.
Additional Tips for Better Air Quality
- Add Indoor Plants: While not a primary CO₂ solution, plants like snake plants, pothos, and peace lilies support oxygen production.
- Seal Cracks: Prevent outdoor pollution and CO infiltration by sealing window and door gaps.
- Use Ceiling Fans: Fans help circulate air and reduce stagnant air pockets where CO₂ can accumulate.
Finally
CO2 buildup indoors can go unnoticed but has significant effects on health and comfort. Fortunately, with a proactive approach that includes proper ventilation, regular maintenance, and smart monitoring, you can keep CO2 levels in check and create a healthier home.
By following the 12 strategies outlined in this guide, you’ll not only improve air quality but also enhance your overall well being, sleep, and productivity.
FAQs
Can high CO2 levels make you sick?
Yes. Prolonged exposure to high CO2 levels can cause fatigue, confusion, and in extreme cases, serious health issues.
Do air purifiers reduce CO2?
Most air purifiers do not remove CO2 but may help with related air quality issues. Advanced models with sensors can help manage indoor environments.
How can I measure CO2 at home?
Use a smart air quality monitor or indoor CO2 detector for accurate readings. Look for models that also track VOCs, humidity, and temperature.
What is the fastest way to reduce indoor CO2?
Opening windows and increasing ventilation is the fastest and most effective method. Stay proactive, and breathe easier knowing your home has cleaner, healthier air to breath.
