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Node-S Air Sensor
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Node-S Air Sensor

Clarity’s flagship particulate matter (PM) and nitrogen dioxide (NO₂) monitor is self-powered, FCC/CE certified, MCERTS-certified for use with solar power, UV-resistant, and weatherproof.

A truly self-sufficient IoT air quality monitoring system with solar harvesting, internal battery, and global cellular communications, the Clarity Node-S accommodates site-specific requirements according to the customer’s needs, not the other way around. In fact, we’re so confident in the Node-S’s ability to amaze, our solution comes with free hardware replacements.

Using an Apple device? Download an interactive 3D model of the Clarity Node-S here.

Get a QuoteTechnical Specifications

Field-tested air quality measurement equipment

Sally Newsom

Member, Clean Air 4 Schools

“Affordable, accessible tech like the Clarity Node-S is a total game changer. It’s giving power to the people and I love that, it’s really exciting.”

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Elisha Mulilo

Air Quality & Emissions Specialist, Kansanshi Mine

“The feedback from management to the new Clarity network has been amazing. Now they’re able to identify a day with a higher reading and say, ‘What was happening on this date?’ and we can follow up immediately.”

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Dr. Kofi Amegah

Project Lead and Professor at University of Cape Coast

“The impact has been enormous, and it will continue to be so. We can’t discount the fact that the Clarity Node-S sensors have been instrumental to the impact that we are achieving. The sensors are very reliable, and the measurements are continuous.”

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Bill Hayes

Air Quality Program Coordinator, Boulder County Public Health

“I’m now able to see where each one of my monitors is. The color of the dot tells me what air quality it’s currently recording. I can then click on any one of those individual monitors to get more information.”

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Cody Cook-Winscher

Air Quality Specialist at the Quinault Indian Nation Environmental Protection Department

"We did assess other monitoring solutions. Ultimately, reliability, durability, pricing, and connectivity even in remote areas were our primary reasons for selecting the Clarity Node-S. The solar panel option made siting far more convenient, and we have never had battery issues."

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Sargis Manukyan

Director of the Technology Management Center of Yerevan City

"Clarity’s innovative technology has significantly improved our understanding of urban air pollution and its impact on public health and the environment. The system’s accuracy, reliability, and user-friendly interface have proven to be extremely effective tools for both decision-makers and the public. It provides real‑time, accessible data that enables informed policy development and empowers citizens with the knowledge to take action. This initiative has been highly appreciated by local authorities, environmental specialists, and the general public.”

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Joseph K. Lyou, Ph.D.

President & CEO of the Coalition for Clean Air

"The Node-S devices worked and the data was much better than other low-cost sensor data — Clarity pays attention to and cares about trying to get as accurate data as possible.”

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Begaim Alipova

Head of Atmospheric Pollution Observation Division, Kyrgyzhydromet

"In 2020, we installed 50 sensors in the city of Bishkek. Since the Clarity Node-S sensors installed in Bishkek are small, we installed them all over the city. We placed some of them near roads, some in residential areas, and some in social facilities. Thanks to the Global SIM Card which is incorporated in the sensors, we get the data directly to our system which allows us to visualize the data. The data is ready for analysis.”

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Richard Stedman

Air Pollution Control Officer at the Monterey Bay Air Resources District

"We don’t have a lot of staff time to spend setting up or fine-tuning this equipment — Clarity’s managed service model allows us to multiply the number of Node-S sensors in our network with minimal additional overhead on our end. We're going from six particulate matter monitors to more than 20 — with one placed in each local municipality — so we expect to have more granularity in looking at how smoke impacts people across our three-county jurisdiction."

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Dr. Ian Longley

Principal Scientist - Air Quality, National Institute of Water and Atmospheric Research

"We needed high-density data to develop a model that was representative of a real situation on a very local scale – so multiple devices and multiple locations. The Clarity Node-S was ideal for this use case."

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Matt Holmes

Air Quality Consultant and former Executive Director, Groundwork Richmond

"We couldn’t have done it with any other air quality monitoring solution. With their unique ability to operate off-grid, Clarity’s Node-S provided the ability to site our air quality monitors in the locations that mattered most to community members in Richmond. The data are reliable, real-time, and hyperlocal, and our network is now being used as a blueprint for AB 617, a landmark regulation that empowers communities to take control of air pollution."

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Michael Ogletree

Air Quality Technical Services Program Manager at the DDPHE

"Clarity provided an off-the-shelf solution that was easy to deploy. Clarity Nodes are easy to set up and after reviewing a co-location we had in place, the data was in line with our expectations. The flexibility in changing the data capture rate was key — I was able to remotely configure the nodes to collect data at a higher or lower resolution as needed."

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Dr. Stig Hellebust

Lecturer in Physical Chemistry, University College Cork

We work mainly with the local authorities for deploying the Node-S devices — with the local council. The community has been really helpful and has made a big difference. The majority of the Nodes are up on street lamps around the town.

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Timothy Baker

Deputy Manager of ERG's Measurement Team

We use our reference network with collocated Node-S devices to make estimates of the interactions between the pollutants. This also helps us to make adjustments for the weather conditions like relative humidity, how damp is the air, how hot is the air.

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Andrew Grieve

Senior Air Quality Analyst, Imperial College London

"The Clarity Node-S is light, it has a small solar panel, and it's reliable. We can put them anywhere. All of those things combined mean it is super easy for communities to put them up by themselves." 

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Bill Hayes

Air Quality Program Coordinator, Boulder County Public Health

"The Node-S is solar powered, has impressive battery life, and transmits data via cellular network. That means we could put these monitors anywhere that the sun shines and you can make a cell call. After the Marshall fire we installed a total of 22 monitors in the burn area. "

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Elisha Mulilo

Air Quality & Emissions Specialist, Kansanshi Mine

“There's less maintenance with Clarity’s compact Node-S device — remote monitoring of device health  means less cost to actually go to that particular site for maintenance. That time and cost-saving measure is critical for our business.”

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Eddie Ahn

Executive Director, Brightline Defense

"Clarity was our first-choice air quality monitoring provider for several reasons. We enjoyed working with the Clarity team - they are highly knowledgeable and always responsive. The Node-S devices themselves are also incredibly resilient, which was especially important for us when deploying the monitors in emergency conditions during the wildfire events this past year."

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William Chevalier

Supervising Air Monitoring Specialist, Monterey Bay Air Resources District

"Clarity works very nicely for our wildfire air monitoring network. Their Node-S sensors are very quick to install and very easy to use, thanks to the native solar panel and cellular antenna. Not having to use somebody else's WiFI in a remote location is great — that had been a major issue for us with several projects.”

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Adrian Rehn

Project Leader, Valley Vision

“We're a nonprofit, so we don't have a ton of capacity to mess around with tech. Clarity Node-S devices are easy to deploy and solar-powered, so you can put them in parks, on rooftops, wherever — and they just work. We can focus on working with our community members.”


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Julie Orth

Class Teacher, Sierra Waldorf Elementary School

"Having the Node-S air quality monitoring device on site is great for our school and a nice service to offer our surrounding community. Our device went in about 3 years ago and is working great! It is so important for us to know our air quality. Whenever it hits unhealthy levels, we keep our students inside. The data is available right on my phone, so I can check it ahead of recess and make a real-time decision on whether to send students outside or keep them on an indoor activity schedule when air quality is over the threshold. "

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Matt Holmes

Air Quality Consultant and former Executive Director, Groundwork Richmond

"We couldn’t have done it with any other air quality monitoring solution. With their unique ability to operate off-grid, Clarity’s Node-S provided the ability to site our air quality monitors in the locations that mattered most to community members in Richmond. The data are reliable, real-time, and hyperlocal, and our network is now being used as a blueprint for AB 617, a landmark regulation that empowers communities to take control of air pollution."

Read Customer Story
Get in touch to learn more!

Accurate air quality measurements with Sensing-as-a-Service℠

Sensing-as-a-Service℠ is built for seamless air quality sensor network deployment, data management, and quality control at any project scale. Whether you're a regulator, private company, researcher, or community group, Sensing-as-a-Service ensures delivery of the high-quality air pollution measurements you need to drive real change.

Hardware

Easily deployed air monitoring devices

Solar-powered Clarity Node-S air quality sensor measures PM2.5 and NO2 and serves as a platform for additional modules that measure Black Carbon, Dust, Multi-Gas, Ozone, and Wind.

Explore our devices
Cloud

Cloud data management & visualization

Air quality measurements and air sensor network status are easily accessible in real-time via Clarity’s user-friendly Dashboard, REST API, and OpenMap.

Learn more about Clarity Cloud
Support

Expert air quality project support

An experienced Environmental Project Manager to help you define a project plan and guide you through Collocation and Calibration of your devices.

Meet our team

Node-S Air Pollution Sensor Specifications

Feature Clarity Dust Module Plantower-based sensors
Direct PM10 measurement Yes No, calculated from PM2.5
Humidity control Heated inlet None or passive
Accuracy Near-reference-grade; collocation results available Indicative only
Cloud QA/QC Automated or custom calibrations, handled by Clarity User-managed or none
Solar power Native integration with Clarity solar power options Requires external integration
Cellular connectivity Built-in via the Node-S Requires Wi-Fi or external modem

Solar-Powered Node-S Air Quality Sensor vs. Reference Air Monitor

Feature Clarity Dust Module Plantower-based sensors
Direct PM10 measurement Yes No, calculated from PM2.5
Humidity control Heated inlet None or passive
Accuracy Near-reference-grade; collocation results available Indicative only
Cloud QA/QC Automated or custom calibrations, handled by Clarity User-managed or none
Solar power Native integration with Clarity solar power options Requires external integration
Cellular connectivity Built-in via the Node-S Requires Wi-Fi or external modem

Professional-Grade Node-S Air Quality Measurement vs. Consumer-Grade Sensors

Feature Clarity Dust Module Plantower-based sensors
Direct PM10 measurement Yes No, calculated from PM2.5
Humidity control Heated inlet None or passive
Accuracy Near-reference-grade; collocation results available Indicative only
Cloud QA/QC Automated or custom calibrations, handled by Clarity User-managed or none
Solar power Native integration with Clarity solar power options Requires external integration
Cellular connectivity Built-in via the Node-S Requires Wi-Fi or external modem

Collocation Results: Accuracy and performance testing reports for
Node-S Air Sensor

Roosevelt, UT - EPA FASM Base Testing Report

August 10, 2024
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October 23, 2024

Reno, NV - EPA FASM Base Testing Report

June 7, 2024
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October 15, 2024

New York City, NY - EPA FASM Base Testing Report

May 1, 2024
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June 30, 2024

Commerce City, CO: EPA FASM Base Testing Report

January 1, 2024
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January 30, 2024

San Francisco, California

July 1, 2020
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July 1, 2021

United Kingdom

March 15, 2022
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August 15, 2022

Perth, Australia

January 15, 2022
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October 15, 2022

Paris, France

February 1, 2019
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December 1, 2019

MCERTS Performance Evaluation

July 1, 2021
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October 1, 2022

QUANT Performance Evaluation

July 1, 2021
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January 1, 2022

Clean Air Asia Performance Evaluation

August 1, 2020
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May 1, 2022

Los Angeles, California

October 1, 2022
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October 1, 2023

Frequently Asked Questions

What specific pollutants does the Clarity Node-S measure?

The Clarity Node-S measures PM2.5 and nitrogen dioxide (NO₂). It also supports a variety of Add-On Modules to measure ozone (O₃), PM10, carbon monoxide (CO), and black carbon — all key pollutants linked to traffic, industrial emissions, and wildfire smoke. It can also integrate wind and meteorological modules for enhanced analysis of pollutant movement and dispersion.

How accurate is the Clarity Node-S compared to traditional monitoring equipment?

While not a regulatory-grade monitor, the Node-S delivers high-quality, actionable data when calibrated and quality-assured properly. It has undergone colocation testing alongside federal reference monitors in projects across California, Oregon, and Europe, demonstrating strong correlation and performance in both stable and dynamic air quality conditions.

Is the Node-S suitable for both urban and rural environments?

Yes — the Node-S air quality sensor is designed to perform well in a wide range of settings. Its solar power and cellular connectivity make it ideal for rural and remote deployments, while its modularity and small footprint make it equally effective in dense urban environments, where it can monitor hyperlocal variations in pollution.

Can the Node-S operate effectively in extreme weather conditions?

Absolutely. The Node-S air pollution sensor features a rugged, weatherproof housing (IPX3 rated) and can operate reliably in temperatures ranging from -10°C to 55°C. It has been successfully deployed in environments ranging from tropical Southeast Asia to high-altitude regions of Central Asia, as well as wildfire-affected zones in the Western U.S.

How is data from the Node-S transmitted and accessed?

Node-S air quality sensors transmit air quality data via built-in cellular connectivity, eliminating the need for external internet or power infrastructure. The data is sent securely to the Clarity Dashboard, where users can view real-time maps, configure alerts, download reports, and share data with stakeholders.

How often does the Clarity Node-S require calibration or maintenance?

The Node-S air pollution sensor is low-maintenance by design. Routine operation requires minimal physical upkeep, and calibration is handled through Clarity’s automated QA/QC and optional Project Support Services. For optimal accuracy, we recommend initial colocation and periodic field validation depending on project goals.

How long does the battery last for? What if we have a day without the sun?

We are the only air quality measurement provider that offers out-of-the-box solar and battery-powered hardware to make deployment truly scalable and frictionless. Our solution requires a single hour of direct sunlight per day on average for steady-state operation, and can operate for up to 30 days with no sunlight at all. To deal with extreme conditions, the devices are able to detect decreasing power availability autonomously and to gradually slow down sampling (until total “hibernation” if needed) to preserve power, avoid damaging the battery, and go through rare stretches of prolonged periods without sunlight, maintaining the measurement coverage as uniform as possible. Once power availability is back to sustainable levels, the devices come back to default operation without need for intervention.

What is the lifetime of the Node-S?

The Clarity Node-S is designed to operate in the field for at least 2 years without the need for any maintenance intervention, but in practice, we have seen them run without problems for many years. Our device comprises a main weatherproof enclosure and a sensor module housed inside the main enclosure while interfacing with the ambient air. The sensor module is able to draw in air while keeping the main enclosure isolated from the sample and thus from dust and moisture. The resulting assembly has a combined ingress protection rating of IPX3, while all the componentry, excluding the sensor module,e is kept at an ingress protection rating of IP67. We offer free replacement with a limited warranty of our Node-S air quality monitoring hardware for subscribed members.

Is the Node-S weatherproof?

The Node-S air quality sensor has been designed to perform in different weathers and is able to resist extreme weather events such as sandstorms, snowstorms, and strong winds. Clarity’s Node-S devices can operate in remote environments where sandstorms may be more common, and can also do so without a hardwired power connection or WiFi connectivity, which may not be available in the area where air quality must be measured.

What is optical sensing for particulate matter?

Optical sensing is a methodology to measure pollutants by detecting light intensity. It is an electronic detector that converts light into an electronic signal. For example, when a particle present in the air crosses the laser beam, it is illuminated and it scatters light. The photodiode receives the scattered light, and the signal reads high and therefore indicating its presence.

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