Indoor air quality plays a major role in our health, productivity, and comfort. Yet, most smart homes still lack proper tools to monitor what’s actually in the air. The AirGradient One aims to change that with professional-grade sensors, open-source hardware, and full local integration with Home Assistant.
In this review, I’ll share my experience after several weeks of testing this air quality monitor in different rooms of my home.
⭐ Buy the AirGradient One Indoor Monitor here: https://www.airgradient.com/shop/?ref=24 . Discount code: SABP13ET ⭐
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What Is the AirGradient One?
The AirGradient One is a multi-sensor indoor air quality monitor that works both as a standalone device and as a fully local Home Assistant integration. It measures:
- CO2 (Carbon Dioxide)
- PM1.0, PM2.5, PM10 (Particulate Matter)
- VOCs (Volatile Organic Compounds)
- NOx (Nitrogen Oxides)
- Temperature & Humidity
It features a sturdy housing, built-in display, and LED indicator for instant feedback.
Installation and Setup
Installing the AirGradient One is refreshingly simple.
After connecting it to a USB power adapter, the device creates its own WiFi access point. You connect to it with your phone or computer, enter your WiFi details, and the latest firmware installs automatically.
Once connected, Home Assistant immediately discovers the sensor. Adding it takes only a few clicks, and all measurements become available instantly.
If you don’t use Home Assistant, AirGradient also provides a free cloud dashboard with historical data, alerts, and device settings.
Local, Cloud, or Both
One of the biggest advantages of the AirGradient One is flexibility.
You can use it:
- Fully standalone
- Locally with Home Assistant (no cloud)
- Via AirGradient’s cloud platform
- With MQTT or API integrations
For privacy-focused smart home users, the fully local option is a major plus.
Monitoring Air Quality in Practice
CO2 Levels
Carbon dioxide builds up quickly in occupied rooms. High levels can cause headaches and reduced concentration.
With Home Assistant automations, you can receive notifications or automatically open windows when CO2 rises.
Particulate Matter (PM)
Fine particles like PM2.5 pose serious health risks. The AirGradient One measures particles from PM1.0 to PM10 with high accuracy.
During testing, my kitchen showed higher PM values—possibly caused by cooking and pet activity—highlighting how useful continuous monitoring can be.
Volatile Organic Compounds (VOCs)
VOCs come from everyday products like cleaning agents, paint, and printers. Instead of focusing on absolute values, the sensor tracks changes over time, making it easier to identify pollution sources.
Nitrogen Oxides (NOx)
NOx mainly originates from traffic and combustion. While the sensor doesn’t measure absolute levels, it detects changes that help identify pollution events.
Temperature & Humidity
Basic climate data completes the picture and supports more advanced automations.
Sensor Quality and Accuracy
AirGradient uses high-quality sensors from trusted manufacturers like:
- SenseAir
- Sensirion
- Plantower
Each device undergoes a 24-hour test before shipping, and AirGradient collaborates with universities to improve accuracy.
This makes the AirGradient One more reliable than most DIY ESPHome projects.
Home Assistant Dashboard
I created a custom dashboard to display all measurements in one place. This makes it easy to spot trends, detect problems, and fine-tune automations.
Multiple days—or even years—of historical data can be visualized.
Real-World Testing
I tested the AirGradient One in my:
- Office
- Kitchen
- Bedroom
The office performed best, likely thanks to my airwasher. The kitchen showed higher particulate levels, while the bedroom had moderate CO2 and PM values.
These insights helped me identify where additional ventilation or purification could be useful.
Pricing and Versions
The AirGradient One is available in two versions:
- Fully assembled: $195
- DIY kit: $138
Both offer the same functionality, depending on your preference.
⭐ Buy the AirGradient One Indoor Monitor here: https://www.airgradient.com/shop/?ref=24 . Discount code: SABP13ET ⭐
Conclusion
The AirGradient One is a powerful, flexible, and accurate air quality monitor for smart homes.
With open-source hardware, professional sensors, and full Home Assistant integration, it’s an excellent choice for anyone serious about indoor air quality.
If you suffer from allergies, respiratory issues, or simply want a healthier home, this device is well worth considering.
- Website Airgradient: https://www.airgradient.com
- Specifications of the AirGradient One Indoor Monitor: https://www.airgradient.com/indoor/
- Specifications of the AirGradient Open Air Outdoor Monitor: https://www.airgradient.com/outdoor/
- Technical data: https://airgradient.com/indoor/#comparison
- Firmware: https://www.airgradient.com/documentation/firmwares/
- Dashboard: https://app.airgradient.com/dashboard
- Buy the AirGradient One Indoor Monitor here: https://www.airgradient.com/shop/?ref=24 . Discount code: SABP13ET
- Buy the Venta Airwasher. Amazon.com | Amazon.co.uk | Amazon.nl | Amazon.de
