Indoor air quality monitors / Comparison

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Consumer monitoring packages for US buyers. These comparisons do not certify indoor safety, diagnose health conditions or replace dedicated smoke/CO alarms or professional testing.

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Documented specifications and exact purchase packages
Compare the details	ONE (US selection)
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US purchase package	AirGradient ONE I-9PSL fully assembled, shipped to US; not DIY kit. Product & sources One standard consumer monitor in the specified US selection. Optional hubs, extra sensors and commercial services are not assumed included. Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Where to buy	Select: AirGradient ONE I-9PSL fully assembled, shipped to US; not DIY kit. View at AirGradient — ONE (US selection); opens in a new tab The link may open several packages. Check current price and availability with the seller. Opens in a new tab.
External rating	4.86 out of 5 from 420 ratings · AirGradient store · Checked October 23, 2026.
Direct CO2 sensing Whether a dedicated CO2 sensing method is documented. Do not substitute derived eCO2 from another gas sensor for a direct CO2 measurement.	Yes Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
CO2 method and revision The manufacturer-described CO2 sensing technology. The method alone does not establish calibrated accuracy or identical behavior between revisions.	NDIR; SenseAir S8/S88 sensor revision as documented for the supplied unit. Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
PM2.5 sensing Whether a particle sensor for PM2.5 is documented. CO2, particles and gases are different quantities. One sensor does not measure all of them.	Yes Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Radon sensing Whether the product includes a documented radon sensor. Keep sensor presence separate from professional test certification, local rules and interpretation of results.	No Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
VOC signal type The documented VOC-related output or its absence. A relative index, total-VOC estimate and compound-specific concentration are not interchangeable.	Relative TVOC and NOx indices from SGP41; not compound-specific concentrations. Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Temperature and humidity Whether both temperature and relative humidity sensing are documented. Use the placement and operating conditions in the manual; a shared room does not imply identical readings.	Yes Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Numeric display on the device Whether the device itself displays numeric readings. A coloured indicator is not a numeric display. App readings are a separate viewing route.	Yes Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Data connection The documented local or internet connection path. Bluetooth synchronization does not by itself provide remote access from outside the home.	2.4 GHz Wi-Fi; local integration is documented separately from hosted services. Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Power and included equipment Power source and relevant package equipment. A supplied USB cable does not establish a supplied wall adapter. Battery life depends on usage and settings.	USB-powered; 2 m USB-C to USB-A cable included, power plug excluded. Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
History, export and service conditions Documented ways to view or retain data and the applicable service limits. Local readings, a cloud dashboard, export and commercial API rights are different entitlements.	12 months of hosted dashboard/API access are included; local server and Home Assistant options have their own setup requirements. Source · 2026-10-11 AirGradient: ONE fully assembled I-9PSL specifications and service scopeChecked 2026-10-11. We reviewed the official page text on the check date. Checkout options were not verified.
Questions to check before buying	Read the source notes for the exact package and operating conditions.

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