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Head-to-head · Best Air Quality Monitors

AirGradient One vs Amazon Smart Air Quality Monitor

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

AirGradient One comes out ahead by a clear margin (4.0 vs 3.5). AirGradient One is best for: DIY enthusiasts. Read the strengths below before deciding.

AirGradient One
Higher ratedRanked #5 in Best Air Quality Monitors
AirGradient One
1 source$230as of Aug 3

The AirGradient One measures carbon dioxide, PM2.5, VOCs and NOx on an open-source board, sold assembled for $230 or as a $138 kit. It uses better-specified sensors than most consumer monitors at the price, exposes every reading to Home Assistant and ESPHome, and keeps the data yours. What it asks in return is a tolerance for setup work: a browser-based Wi-Fi handoff, Torx screws that strip, and no radon sensor at all.

Strengths
  • — Easy to assemble and configure with user-friendly instructions
  • — Provides accurate readings for CO₂, PM₂.₅, VOCs, and NOₓ sensors
  • — Affordable pricing with a kit option available for 138 USD, according to The Home Assistant Blog
Watch-outs
  • — The Home Assistant Blog found the initial WiFi hotspot setup problematic
  • — Lacks radon sensor compared to competitors like Airthings View Plus
$230 · Buy at airgradient.comFull review →
Amazon Smart Air Quality Monitor
Ranked #4 in Best Air Quality Monitors
Amazon Smart Air Quality Monitor
3 sources$69.99as of Oct 11

The Amazon Smart Air Quality Monitor reads PM2.5, VOCs, CO, humidity, and temperature and rolls them into an indoor air quality score. PCMag called it 'fairly limited in terms of functionality' while noting it 'easily alerts you to pollutants and other gaseous impurities.' It ties into Alexa for notifications and voice control and charts air quality over time. It does not purify air, and it skips CO2 and radon, which some reviewers called significant limitations. Buyers who want basic air quality awareness rather than comprehensive purification are the fit.

Strengths
  • — Measures PM2.5, VOCs, CO, humidity, and temperature
  • — Provides hourly, daily, and weekly air quality graphs
  • — Indicator light shows current air quality at a glance
Watch-outs
  • — Does not purify the air
  • — Only measures PM2.5, not PM10 particles
  • — Does not measure CO2 or radon gases
$69.99 · Check Price on AmazonFull review →

How they stack up

AirGradient One

The AirGradient One excels in ease of setup and Home Assistant integration, making it more user-friendly than the Airthings models, which use lower-tier sensors and lack radon detection. While it doesn't match the Qingping Gen 2's sensor accuracy, it provides a more affordable option with good performance across CO₂, PM₂.₅, VOCs, and NOₓ sensors, making it a strong alternative to the more expensive Airthings devices.

Amazon Smart Air Quality Monitor

The Amazon Smart Air Quality Monitor provides basic air quality awareness with PM2.5, VOCs, CO, humidity, and temperature measurements, but it lacks CO2 and radon detection that other models like the Airthings 2960 View Plus offer. While it integrates well with Alexa, its limited sensor range makes it less comprehensive compared to the Atmotube PRO 2, which provides more detailed particle measurements and GPS tracking.

Specs side-by-side

SpecAirGradient OneAmazon Smart Air Quality Monitor
SensorsCO₂, PM₂.₅, VOCs, NOₓSensirion SEN44, Figaro TGS5141
ConnectivityWiFi 2.4GHz, Bluetooth LE, Bluetooth 5, Bluetooth mesh2.4GHz Wi-Fi, BLE 4.2
Power SourceUSB 5V 2AMicro-USB (5W)
DisplayOLED—
Dimensions5.12 x 5.12 x 1.38 in1.8 x 2.6 x 2.6 in
Weight0.77 lb0.26 lb
AppAirGradient Dashboard, Home Assistant, HomeyAmazon Alexa app
MeasurementsPM2.5, CO2, TVOCs, NOx, Temperature, HumidityPM2.5, VOCs, CO, humidity, temperature
← See the full ranking of best air quality monitors