Market IndexProduct intelligenceIndoor air-quality monitorsSearch products
All marketsPremium indoor air-quality monitorsAirGradient

AirGradient · I-9PSL

AirGradient ONE

A repair-oriented display monitor combining NDIR CO2, optical PM, metal-oxide VOC and NOx indices, temperature and humidity with local, Home Assistant and AirGradient platform paths
Market statusCurrent supported open-data multi-pollutant room monitorChecked Aug 18
Reference price$230 current fully assembled U.S. referenceAirGradient's current direct page lists the assembled I-9PSL at $230 with a 12-month platform and API allowance
Product cyclecurrentRelease history under review
EvidenceWell supported7 publishers · 2 independent
Next full checkAug 25, 2026Price checks run sooner
01

Ready to buy

Confirm the exact monitor and data path

The retained reference is $230 current fully assembled U.S. reference. Confirm the model, sensors, calibration, sampling, app or local history, privacy, power, placement, stock, returns and written U.S. support before payment.

Buying stageMarket familiarity
02

Current market

The facts that change the ownership choice

Each line carries its own check date because price, software, specifications, and product cycle do not age at the same speed.

QuestionCurrent answerFreshnessBasis

Current price

$230 current fully assembled U.S. reference

Confirm U.S. stock, shipping, tax, included platform term, adapter and the exact assembled rather than kit configuration at checkout

Refresh due soonDirect source1 evidence item

Market branch

open-data and replaceable-sensor room monitoring
Checked 6 days agoOur synthesis2 evidence items

Purchase boundary

The retained $230 is for the fully assembled indoor model; a USB-C cable is included, a wall adapter is not, and the free platform period, self-hosting choice, shipping, tax and sensor replacements remain separate decisions
Checked 6 days agoOur synthesis3 evidence items

Sensor suite and exclusions

Senseair S8 NDIR CO2, dual Plantower PMS5003 optical particulate sensing, Sensirion SGP41 VOC and NOx indices, and Sensirion SHT40 temperature and humidity are retained for I-9PSL; the indices do not identify a gas or quantify a specific compound
Checked 6 days agoDirect source2 evidence items

Ranges, accuracy and disclosed gaps

The retained maker specifications are CO2 0 to 10,000 ppm at ±40 ppm plus 3 percent, PM2.5 ±10 µg/m³ from 0 to 100 and ±10 percent from 100 to 500, temperature ±0.3°C and humidity ±2 percent; VOC and NOx are relative index outputs, not laboratory concentrations
Checked 6 days agoDirect source3 evidence items

Calibration, drift and response

CO2 automatic baseline correction assumes periodic exposure near outdoor background and can be disabled or manually checked; PM and gas modules need clean inlets, co-location checks and eventual replacement. Screen values refresh in seconds, but short response is not proof of accuracy and gas indices require baseline settling
Checked 6 days agoOur synthesis5 evidence items

Data, app and cloud

The color display works at the device; Wi-Fi supports the AirGradient dashboard and API, local data and Home Assistant or self-hosted routes. Retain firmware, sampling, upload and local-versus-cloud settings because they change history, access and continuity
Checked 6 days agoDirect source3 evidence items

Privacy boundary

Cloud use sends device readings and account or network-related data under AirGradient's policy; local API or self-hosting can reduce dependence but does not erase Wi-Fi, phone or administrator exposure. Confirm public sharing, retention and deletion settings for occupied schools and workplaces
Checked 6 days agoOur synthesis2 evidence items

Power and placement

Continuous USB-C power is required and the adapter is separate. Place in the occupied breathing zone away from windows, supply vents, humidifiers, cooking plumes and direct sun unless testing that source; heat from electronics and wall mounting can bias temperature or room representation
Checked 6 days agoOur synthesis3 evidence items

Service and lifecycle

The current assembled unit has a 12-month warranty and a documented replaceable-module path. Confirm replacement sensor availability, platform terms, firmware support, return shipping and who will perform periodic checks before institutional deployment
Checked 6 days agoDirect source2 evidence items

Interpretation boundary

Use CO2 as an occupancy and ventilation clue, PM as an aerosol trend and VOC or NOx indices as nonspecific change signals. Compare with a trusted co-located instrument and outdoor context before action; the monitor cannot name a source, diagnose health, certify ventilation or clear a room as safe
Checked 6 days agoOur synthesis5 evidence items

Consumer sensor versus reference method

Published ranges and nominal errors describe manufacturer conditions, not traceable performance for every unit, aerosol, gas mixture, humidity, firmware, age or site. Use co-location and documented quality checks; do not substitute this monitor for a regulatory, occupational, laboratory, radon or life-safety method.
Checked 6 days agoOur synthesis4 evidence items

Seller and region

The price is retained for a current U.S. new-device path. Confirm exact model, authorized seller, electrical and radio region, stock, tax, delivery, returns, written warranty, replacement parts, app and cloud service before payment.
Checked 6 days agoOur synthesis2 evidence items

Current verdict

The open-data reference

AirGradient ONE is the strongest defended route when local access, documented modules and replaceable sensors matter more than a polished closed ecosystem, provided the owner accepts consumer-sensor drift and calibration work.

Checked 6 days agoOur synthesis13 evidence items
03

Other paths

The alternatives change what the AirGradient ONE is worth

These are not generic competitors. Each one represents a different way to buy into the same market.

01ownership

Airthings

View Plus

$329.99 current direct U.S. price
Best fit
broad household sensing with long-term radon
Tradeoff
The retained $329.99 covers the North American 2960 monitor; optional USB power, hub or building dashboard choices, batteries, subscriptions, tax and stock must be confirmed for the intended remote-management path
Open the source
02premium

PurpleAir

PurpleAir Zen

$299 current direct U.S. price
Best fit
dual-channel particulate transparency and public or private mapping
Tradeoff
The retained $299 excludes a USB power supply and optional microSD card, and the current page notes a possible backorder; the BME688 gas signal is not a pollutant-specific VOC concentration
Open the source
04

What changed

The product has a history

Older observations stay in the ledger when the current view changes. That lets a buyer tell the difference between an old complaint, an active issue, and a problem that was corrected.

  1. notable

    Current monitor evidence retained

    AirGradient ONE was checked against current U.S. manufacturer identity and price, exact specification or manual, support and privacy terms, independent evaluation and bounded owner or operator evidence.

Price record

The price history starts here

Each amount stays tied to its source and capture date. Conflicting prices remain visible until the seller resolves them.

  1. $230 current fully assembled U.S. reference

    Current reference priceA structured timeline will begin with the next source capture

05

Owner experience

What repeats after the purchase

Owner and operator evidence is retained as a setup, response, data and service checklist for AirGradient ONE, not an accuracy, reliability, health or safety rate.

Reports are self-selected and span different units, firmware, calibration, sites, pollutants, humidity, event sources, comparisons, networks, accounts and ages. They cannot prove reference accuracy, source identity, population reliability, exposure, health outcome, compliance or safety clearance.
SignalWhat owners reportOur readEvidence

local access, dual-PM agreement, display behavior, calibration and replacement-module handling

Self-selected exact-model owners discuss setup, colocations, app or display behavior, connectivity, drift, false alarms and support. These anecdotes do not establish accuracy, health effects, failure rates or safety clearance for other units.

Log both PM channels and periodic co-locations, record any calibration or module swap, and test the chosen local or cloud path before relying on a long building record

1 evidence record
06

Sources

Why we believe the current view

The page separates what a source states directly from what we conclude across sources.

01
AirGradient ONE current manufacturer recordAirGradient · identity

AirGradient identifies I-9PSL as a repair-oriented display monitor combining NDIR CO2, optical PM, metal-oxide VOC and NOx indices, temperature and humidity with local, Home Assistant and AirGradient platform paths.

Source type
manufacturer
Content hash
c5667816e2fdf69d…
Use
store excerpt
Open AirGradient
02
AirGradient ONE current U.S. priceAirGradient · price

AirGradient's current direct page lists the assembled I-9PSL at $230 with a 12-month platform and API allowance.

Source type
manufacturer
Content hash
0b7c514a9baf3e66…
Use
store snapshot
Open AirGradient
03
AirGradient ONE manual and measurement specificationAirGradient · specification

The current model documentation supports the retained sensor suite, measurement ranges or disclosed absences, calibration and response, power, placement and operating boundaries.

Source type
support
Content hash
fbb4de3d56dc524b…
Use
store excerpt
Open AirGradient
04
AirGradient ONE current support and serviceAirGradient · specification

The current assembled unit has a 12-month warranty and a documented replaceable-module path. Confirm replacement sensor availability, platform terms, firmware support, return shipping and who will perform periodic checks before institutional deployment

Source type
support
Content hash
0fad7d1edc4484b0…
Use
store excerpt
Open AirGradient
05
AirGradient ONE privacy and data termsAirGradient · software

Cloud use sends device readings and account or network-related data under AirGradient's policy; local API or self-hosting can reduce dependence but does not erase Wi-Fi, phone or administrator exposure. Confirm public sharing, retention and deletion settings for occupied schools and workplaces

Source type
support
Content hash
5274a5e65ef1a124…
Use
store excerpt
Open AirGradient
06
How to use air sensors and the Air Sensor GuidebookU.S. Environmental Protection Agency · specification

EPA separates lower-cost air-sensor information from regulatory monitoring and emphasizes study design, siting, quality checks, interpretation and communication of uncertainty.

Source type
support
Content hash
00774782ed9fbe35…
Use
store excerpt
Open U.S. Environmental Protection Agency
07
Improving your indoor environmentU.S. Environmental Protection Agency · specification

EPA places monitoring inside source control, ventilation, filtration and moisture-management decisions rather than treating a sensor reading as source identification, diagnosis or proof of safety.

Source type
support
Content hash
7db9daa987bfadbb…
Use
store excerpt
Open U.S. Environmental Protection Agency
08
Radon guidanceU.S. Environmental Protection Agency · specification

EPA radon guidance uses validated testing, named decision thresholds and mitigation follow-up; a short consumer display change is not a radon clearance result.

Source type
support
Content hash
75d4fad51cab5d99…
Use
store excerpt
Open U.S. Environmental Protection Agency
09
Carbon monoxide fact sheetU.S. Consumer Product Safety Commission · specification

CPSC guidance requires functioning carbon-monoxide alarms and emergency response to alarm or symptom conditions. A general air-quality monitor is not a substitute.

Source type
support
Content hash
cf427cddb9c401bc…
Use
store excerpt
Open U.S. Consumer Product Safety Commission
10
AirGradient and Airthings View Plus reference co-location studyBuilding and Environment · specification

A current peer-reviewed co-location study compares AirGradient CO2 and particulate channels with research references and documents channel-specific agreement, variability and correction needs under the tested indoor conditions rather than granting blanket accuracy.

Source type
editorial
Content hash
e8388926fc89529e…
Use
store excerpt
Open Building and Environment
11
AirGradient ONE owner discussionsIndoor-air monitor owners · consensus

Self-selected exact-model owners discuss setup, colocations, app or display behavior, connectivity, drift, false alarms and support. These anecdotes do not establish accuracy, health effects, failure rates or safety clearance for other units.

Source type
community
Content hash
a403740cce03f825…
Use
store excerpt
Open Indoor-air monitor owners
12
View Plus alternativeAirthings · alternative

View Plus is the broad household sensing with long-term radon alternative at $329.99 current direct U.S. price.

Source type
manufacturer
Content hash
c6809ef3e6cde5e7…
Use
store excerpt
Open Airthings
13
PurpleAir Zen alternativePurpleAir · alternative

PurpleAir Zen is the dual-channel particulate transparency and public or private mapping alternative at $299 current direct U.S. price.

Source type
manufacturer
Content hash
bbcf714a7066e84a…
Use
store excerpt
Open PurpleAir

Manufacturer identity, exact current U.S. price, specification or manual, support, independent evaluation and bounded owner or operator evidence were checked on August 18, 2026. This market covers current complete U.S.-supported indoor-air monitors for serious residential, school, office or building-owner use. It excludes smoke and carbon-monoxide life-safety alarms, basic single-purpose thermometers or hygrometers, sensors integrated into purifiers or dehumidifiers, HVAC controls, laboratory reference analyzers, professional handheld instruments, unsupported marketplace devices, cosmetic bundles and minor connectivity variants. Consumer low-cost sensors are not regulatory or laboratory reference methods. Optical PM estimates mass from scattered light and varies with aerosol, size distribution, humidity, inlet condition, correction and aging. Metal-oxide VOC, eTVOC and gas-index channels respond to mixtures, humidity and rolling baselines, may cross-react and cannot identify a source or specific compound; even a named low-cost formaldehyde channel needs interference and method scrutiny. NDIR CO2 can drift, and automatic baseline correction assumes periodic exposure near outdoor background. CO2 is an occupancy and ventilation clue, not proof of clean air, infection risk or safety. Radon decisions require the named averaging period and confirmation appropriate to EPA guidance. Site monitors in representative occupied air away from vents, windows, heat, direct sun, humidifiers and immediate sources unless testing that source. Nearby outdoor data adds context only when time, distance, weather and source differences are retained. No monitor identifies a source, diagnoses health, certifies ventilation or regulatory compliance, clears a space as safe, or replaces certified smoke and carbon-monoxide alarms. A monitor does not clean air, dehumidify a room or control HVAC unless a separate reviewed system does that work.

Researching another model?

Search the current market