You've heard that indoor air quality matters. You've perhaps seen a monitor displaying numbers like "CO₂: 1,247 ppm" or "Humidity: 63%." But what do those numbers actually mean? Are they alarming? Acceptable? And what should you do when they're outside a certain range?
This guide is a plain-English reference for understanding every number your air quality monitor might show — so you can move from passive data collection to confident, informed action.
CO₂ (Carbon Dioxide) — Measured in Parts Per Million (ppm)
CO₂ is produced by human respiration, combustion (gas stoves, candles, fireplaces), and even fermentation. In outdoor air, it currently sits at approximately 420 ppm. Indoors, it accumulates without ventilation.
| CO₂ Level | Assessment | What You Might Feel |
|---|---|---|
| 400–600 ppm | Excellent ✅ | Alert, energized, clear thinking |
| 600–1,000 ppm | Good 🟡 | Normal, no significant impact for most people |
| 1,000–1,500 ppm | Moderate ⚠️ | Mild fatigue, slight difficulty concentrating; sensitive individuals affected |
| 1,500–2,500 ppm | Poor 🔴 | Headaches, significant brain fog, fatigue, poor decision-making |
| 2,500–5,000 ppm | Very Poor ❌ | Drowsiness, poor concentration, increased heart rate, cognitive impairment |
| Above 5,000 ppm | Dangerous 🚨 | OSHA workplace limit; dizziness, nausea, shortness of breath |
What action to take: If CO₂ rises above 1,000 ppm, increase ventilation. Open a window, door, or run a fresh-air ventilation system. Levels typically drop to 600–700 ppm within 10–15 minutes of adequate ventilation.
Relative Humidity (RH) — Measured in %
Relative humidity measures the amount of water vapor in the air as a percentage of the maximum it can hold at that temperature. It directly affects comfort, health, and your home's structural integrity.
| Humidity Level | Assessment | Concern |
|---|---|---|
| Below 25% | Too Dry ❌ | Dry skin, static, increased virus survival, cracking wood |
| 25–40% | Low ⚠️ | Mild dryness, some discomfort, increased susceptibility to respiratory illness |
| 40–60% | Ideal ✅ | Optimal comfort, minimal allergen and pathogen activity |
| 60–70% | High ⚠️ | Mold risk increases, dust mites proliferate, feeling clammy |
| Above 70% | Too Humid ❌ | Active mold growth, structural damage risk, significant allergen exposure |
What action to take: Below 40%? Use a humidifier. Above 60%? Use a dehumidifier, improve ventilation, or use air conditioning. Focus on the bathroom, kitchen, and basement as primary humidity sources.
Temperature — Measured in °C or °F
Indoor temperature affects everything from comfort and sleep to metabolism and cognition. The "right" temperature varies by time of day and activity:
- Sleep: 16–19°C (60–67°F) — cooler temperatures support deeper, more restorative sleep
- Focused work: 20–22°C (68–72°F) — research finds this optimal for sustained attention
- General daytime comfort: 20–23°C (68–73°F)
- Children and elderly: slightly warmer, typically 21–23°C (70–73°F)
How to Read Your Monitor — A Quick Decision Framework
If you own the Aeris View or another CO₂/humidity/temperature monitor, here's a simple daily routine:
- 1. Morning check: Look at overnight CO₂ peak (shown in trend history). If it exceeded 1,500 ppm, your bedroom needs better overnight ventilation.
- 2. Work session check: Monitor CO₂ every 30–60 minutes. If it climbs above 1,000 ppm, open a window before your focus drops.
- 3. Evening humidity check: After cooking and bathing, check that humidity hasn't spiked above 65%. Run the exhaust fan longer if needed.
- 4. Seasonal temperature check: In winter, confirm bedroom temperature is in the 17–19°C range for optimal sleep. In summer, confirm home office isn't drifting above 23°C.
The Numbers Are Just the Beginning
Understanding these numbers is the first step. The second — and more powerful — step is building the habits that respond to them automatically. Once you've spent a few weeks glancing at your monitor throughout the day, you develop an intuition for when to open a window, when to run the humidifier, and when to nudge the thermostat. The data becomes behavioral change. The behavioral change becomes better health.
That's the real value of air quality monitoring: not the device itself, but the awareness it creates over time.
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