View Plus vs AirGradient ONE (I-9PSL)

Compare sensors, connectivity, certifications, and price side by side, based on official product specifications and manufacturer documentation.

Last updated October 15, 2026 · Comparison published by Airthings

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Radon coverage gap

View Plus measures radon. AirGradient ONE (I-9PSL) does not. Radon is a colorless, odorless radioactive gas — the second leading cause of lung cancer in the US (EPA). Because you cannot detect it without a sensor, this is a meaningful difference for long-term home health monitoring.

View Plus

Airthings

View Plus

Radon COâ‚‚ VOC PM2.5

Connectivity: WiFi (2.4GHz) and Bluetooth Low Energy

Power: 6x AA batteries (up to 2 years) or USB-C for continuous power

$329.99

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AirGradient

AirGradient ONE (I-9PSL)

Radon COâ‚‚ VOC PM2.5

Connectivity: Wi-Fi (2.4GHz) with integrated Bluetooth LE

Power: USB-C (5V/2A adapter, sold separately)

$230

Technical specifications

View Plus (Airthings) AirGradient ONE (I-9PSL)
Radon detection: Yes Radon detection: No
COâ‚‚ monitoring: Yes COâ‚‚ monitoring: Yes
VOC monitoring: Yes VOC monitoring: Yes
PM2.5 monitoring: Yes PM2.5 monitoring: Yes
Connectivity: WiFi (2.4GHz) and Bluetooth Low Energy Connectivity: Wi-Fi (2.4GHz) with integrated Bluetooth LE
Power source: 6x AA batteries (up to 2 years) or USB-C for continuous power Power source: USB-C (5V/2A adapter, sold separately)
Battery life: Up to 2 years Battery life: N/A (mains powered)
Remote access: Connects over Wi-Fi and Bluetooth and syncs to the Airthings app. Readings are also shown directly on the device's built-in customizable display. Remote access: Home Assistant, Homey, or AirGradient dashboard (12 months included)
Works with: Airthings app (iOS, Android, Web); Amazon Alexa, Google Assistant, IFTTT, Homey Works with: Home Assistant, Homey, ESPHome, Prometheus, openHAB
Mobile app: Yes Mobile app: Yes
Web app: Yes Web app: Yes
Subscription: Not required Subscription: Not required
Warranty: 1 year (5 years with registration) Warranty: 12 months
Price: $329.99 Price: $230

Want to understand what these pollutants actually do?

Radon, COâ‚‚, VOCs, and PM2.5 each affect your health differently. Our resource library breaks down what each one is, how it gets into your home, and what levels actually matter.

Explore air quality resources

Certifications and eligibility

View Plus

  • ✓ Calm Tech Certified — Recognizes products designed to minimize unnecessary notifications and attention demands.
  • ✓ HSA/FSA eligible via Truemed — Purchasable with pre-tax Health Savings Account or Flexible Spending Account funds (via Truemed).

AirGradient ONE (I-9PSL)

  • ✓ CE
  • ✓ FCC
  • ✓ RoHS
  • ✓ REACH
  • ✓ RESET Air accredited

Value and ownership costs

View Plus

  • Price$329.99
  • SubscriptionNot required
  • Warranty1 year (5 years with registration)
  • BatteryUp to 2 years
  • + Includes Radon monitoring not in AirGradient ONE (I-9PSL).

AirGradient ONE (I-9PSL)

  • Price$230
  • SubscriptionNot required
  • Warranty12 months
  • BatteryN/A (mains powered)

Airthings

Ready to know what's in your air?

View Plus gives you certified radon detection, CO₂, VOC, and more — all in one device, with no subscription required.

Shop View Plus Explore all monitors

Frequently asked questions

Both devices measure COâ‚‚, VOC (airborne chemicals) and PM2.5 (fine particulate matter). View Plus additionally measures radon. AirGradient ONE (I-9PSL) measures COâ‚‚, VOC (airborne chemicals) and PM2.5 (fine particulate matter).

View Plus: Connects over Wi-Fi and Bluetooth and syncs to the Airthings app. Readings are also shown directly on the device's built-in customizable display.

AirGradient ONE (I-9PSL): Home Assistant, Homey, or AirGradient dashboard (12 months included).

Radon is a naturally occurring, colorless, odorless radioactive gas that comes from the breakdown of rocks and soil. It enters homes through cracks in foundations and gaps such as around plumbing entry points. It is the leading cause of lung cancer among non-smokers and the second leading cause overall (US, EPA, and WHO). The EPA recommends fixing your home if the average radon level is consistently at 4 pCi/L or higher, and considering action if it is between 2 and 4 pCi/L. Because View Plus monitors radon continuously over time, it gives a more reliable picture of your exposure than a single short-term test kit. AirGradient ONE (I-9PSL) does not measure radon.

Specifications for View Plus come directly from the Airthings product catalog, so they automatically stay up to date. AirGradient ONE (I-9PSL) is not part of our product catalog, so its specifications are sourced from their website and product spec sheets, updated periodically.

Airthings products purchased directly from airthings.com can be returned using their 45-day money back guarantee.

View Plus specifications are sourced directly from the Airthings product catalog. AirGradient ONE (I-9PSL) specifications are sourced from publicly available manufacturer documentation, spec sheets, and retailer listings as of October 15, 2026. Prices and specifications are set by the manufacturer and are subject to change without notice; figures shown here may not reflect current availability. Airthings is not affiliated with, endorsed by, or sponsored by AirGradient. All product names, logos, and brands are property of their respective owners and are used for identification purposes only. As of October 15, 2026, items labeled "No information located" reflect that information was not found on the competitor's website or on the product or materials accompanying it. Absence of located information does not indicate absence of the feature. Contact support@airthings.com for corrections.

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