Monitor Your Air Quality with Smart CO2 Sensors
Smart CO2 sensors and air quality monitors help track carbon dioxide levels, humidity, VOCs, and overall indoor air quality. Whether you want a smart home-integrated CO2 sensor or a standalone air monitor, these devices ensure your home stays safe, breathable, and free from harmful gases. This guide compares the best smart CO2 sensors, focusing on their compatibility with Amazon Alexa, Google Home, Apple HomeKit, Samsung SmartThings, Wyze, and Home Assistant.
CO2 Sensor Comparison Chart
| Product | Amazon Alexa | Google Home | Apple HomeKit | Samsung SmartThings | Wyze | Home Assistant |
|---|---|---|---|---|---|---|
| Awair Element Indoor Air Quality Monitor | ✅ | ✅ | ✅ | ✅ | ❌ | ✅ |
| Nest Protect Smoke & CO Detector | ✅ | ✅ | ❌ | ❌ | ❌ | ✅ |
| Airthings Wave Plus | ✅ | ✅ | ✅ | ✅ | ❌ | ✅ |
| Eve Room Air Quality Sensor | ❌ | ❌ | ✅ | ❌ | ❌ | ✅ |
Best Smart CO2 Sensors & Monitors: Detailed Breakdown
Awair Element Indoor Air Quality Monitor
✅ Best For: Homeowners looking for a comprehensive air quality monitor with smart integrations.
✔ Real-Time Air Quality Monitoring – Measures CO2, VOCs, temperature, humidity, and fine dust.
✔ WiFi-Connected & Smart Alerts – Get instant notifications when air quality drops.
✔ Alexa, Google Home, Apple HomeKit & SmartThings Compatibility – Full smart home integration.
✔ Historical Data & Trends – Track air quality over time.
🚀 Pro Tip: Automate your smart thermostat to adjust ventilation when CO2 levels rise.
Nest Protect Smoke & CO Detector
✅ Best For: Those needing a dual smoke and CO sensor with smart alerts.
✔ Advanced Smoke & Carbon Monoxide Detection – Notifies you of smoke or CO leaks via smartphone.
✔ Smart App Notifications – Alerts you in real-time, even when you’re away.
✔ Alexa & Google Assistant Integration – Use voice commands for status checks.
✔ Self-Testing & Battery Monitoring – Ensures your device is always operational.
🚀 Pro Tip: Integrate with smart lights to flash when CO levels are too high.
Airthings Wave Plus
✅ Best For: Users wanting a multi-sensor indoor air quality monitor with radon detection.
✔ Monitors CO2, Radon, Humidity, VOCs, and Temperature – Ideal for health-conscious homes.
✔ Works with Alexa, Google Home, Apple HomeKit & SmartThings – Smart home compatible.
✔ Wave-to-Check Feature – Simply wave in front of the device to see air quality status.
✔ Battery-Powered & Easy to Install – No wiring required.
🚀 Pro Tip: Pair with smart air purifiers for automatic air quality adjustments.
Eve Room Air Quality Sensor
✅ Best For: Apple HomeKit users looking for a HomeKit-exclusive air quality monitor.
✔ Monitors CO2, VOCs, and Temperature – Compact and stylish design.
✔ Apple HomeKit Integration – Works seamlessly with iOS.
✔ Battery-Powered & Portable – Ideal for bedrooms, offices, and nurseries.
✔ Privacy-Focused – No Cloud Storage – Works entirely on local processing.
🚀 Pro Tip: Use HomeKit automations to turn on air purifiers when air quality drops.
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How to Choose the Best Smart CO2 Sensor
Key Features to Consider
✔ CO2 & Air Quality Monitoring – Tracks carbon dioxide, VOCs, and humidity.
✔ Smart Alerts & Automation – Get notified when air quality drops.
✔ Smart Home Compatibility – Works with Alexa, Google, SmartThings, or HomeKit.
✔ Portable vs. Hardwired – Choose a battery-powered or plug-in model.
✔ Long-Term Data Tracking – Monitor air quality trends for health improvements.
“Performance of Low-Cost NDIR CO₂ Sensors for Building Demand Controlled Ventilation and Air Quality Monitoring”
(PubMed Central / National Library of Medicine)
👉 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11397870/
Installation & Setup Guide
What You’ll Need:
- A compatible smart CO2 sensor from the list above.
- WiFi or Bluetooth connection for app-based control.
- Smartphone with the respective app installed (Nest, SmartThings, Eve, etc.).
Step-by-Step Setup Guide:
1️⃣ Place the sensor in a well-ventilated area where you want to monitor air quality.
2️⃣ Download the manufacturer’s app and follow setup instructions.
3️⃣ Connect to WiFi, Z-Wave, or HomeKit as needed.
4️⃣ Calibrate the device by leaving it in one place for initial readings.
5️⃣ Set up automation and alerts to get notifications for CO2 spikes.
⏳ Setup Time: 5–10 minutes per device.
Pro Tips for Maintaining Indoor Air Quality
✔ Keep Windows Open When CO2 is High – Let in fresh air to improve ventilation.
✔ Use Smart Fans & HVAC Systems – Automate air circulation to maintain healthy levels.
✔ Pair with Smart Air Purifiers – Integrate CO2 sensors with air purifiers for automatic filtering.
✔ Monitor Long-Term Trends – Use historical data to identify patterns in your air quality.
✔ Check for Radon & VOCs – CO2 sensors like Airthings Wave Plus also detect harmful gases.
Final Verdict: Which Smart CO2 Sensor is Best for You?
| Best For | Product Recommendation |
|---|---|
| Best Overall | Awair Element Indoor Air Quality Monitor |
| Best for SmartThings & Z-Wave Users | Airthings Wave Plus |
| Best for Apple HomeKit Users | Eve Room Air Quality Sensor |
| Best Budget CO2 Detector | Nest Protect Smoke & CO Detector |
Want to fully automate your home? Check out our smart home guides for thermostats, security systems, and smart lighting.