Plume Labs

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Flow, by Plume Labs


Need more than 10 Flows? Let us know:


Flow, by Plume Labs


A companion to explain what’s in your air, anywhere

Flow makes air quality data personal

We hear about entire cities having a pollution problem. But in reality what you breathe can change dramatically simply from one street to the next.
Flow is the intelligent device that fits into your daily life and helps you make the best air quality choices for yourself, your family, your community.

A health revolution is in the air

Instant insight into your personal exposure

The press of a button illuminates animated LEDs, giving you immediate feedback on what your air’s like—indoors, outdoors, on a bike, riding the subway, or strolling through the countryside.

The detailed picture of what you’ve been breathing

Flow and its companion app give you the minute-by-minute breakdown of the pollutants you were exposed to throughout your day by measuring real-time concentrations of NO2, VOC, PM2.5 and PM10.

A constantly improving guide for healthier routines

With the help of your phone’s GPS, Flow builds out the air quality map of all the places it’s been by your side. So the more you use Flow, the better it will help guide you towards clean air!

A tool to be a part of the solution

There’s protecting yourself against air pollution, and there’s acting to end air pollution. Flow is a leap forward in understanding the problem, and by spreading knowledge, we intend to distribute the power to act.

Designed and tested for life in the real world

We partnered with world-leading experts to redefine what environmental technology can be: Frog for our design, Imperial College London’s Centre for Environmental Policy for our beta test, and France’s CNRS-LISA to stress-test our sensing technology.

Compact and cutting-edge

360 Air Intake

The biggest challenge with Flow-sized sensing technology is perfectly reproducing outside air conditions inside the device. We’ve built the solution right into the design: the holes carved all around Flow’s polished steel sleeve are Plume Labs’ exclusive 360 Air Intake. Combined with the smallest fan technology available, they guarantee optimal air circulation.

Miniaturized Pollutant Detection

Flow’s sensing technology makes the most of the science available for such a high degree of miniaturization and portability: light-scattering and metal-oxide reactions.

Light scattering: by aiming a laser at the stream of air brought in by Flow’s fan, the light scattered by passing particulate matter is translated into measurable electrical current by a built-in photovoltaic cell.

Metal-oxide reactions: a miniature membrane is heated up to 350°C, capturing all NO2 molecules or Volatile Organic Compounds it makes contact with. The resulting variations in electrical current are what Flow turns into a measurement.

Neural Networks and Filtering

Thanks to four years of research and development, the accuracy and reliability of Flow’s onboard sensing technology has been pushed above and beyond what light scattering and metal-oxide reactions could do.

Flow’s neural networks and filtering algorithms are programs trained to detect patterns in large datasets and extract the signal from the noise. Because their learning patterns mimic the human brain, the more data they analyse, the more accurate they become. Combined with Flow’s self-calibration algorithms, the more you use your device, the better it gets!

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Size & weight

  • Height: 4.9 inches (125 mm)
  • Width: 1.5 inches (40 mm)
  • Depth: 1.3 inches (35 mm)
  • Weight: 0.1lbs (70 g)


  • Bluetooth Low Energy (BLE)
  • Charging: USB-C & custom metal contacts
  • Battery: typical daily use charge of 24h
  • Non-animal leather strap

In the box

  • Plume Labs Flow
  • USB-C to USB cable (6ft)
  • Documentation
  • Charging dock

  • Flow can be charged either via its USB socket or its metal contact connectors by placing it on the included dock. Please note that while both methods work over your computer’s USB, in order to charge Flow on a regular power outlet you will need to purchase a power adapter separately.

Plume Labs in the press

Clean air, together

Plume Labs’ purpose for Flow is to make the challenge of environmental health so compellingly clear that not acting becomes inconceivable. A tool to connect, and a tool to empower.