PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor
PurpleAir Zen Air Quality Monitor

PurpleAir Zen Air Quality Monitor

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Sale price

The PurpleAir Zen is the latest air quality monitor from PurpleAir, measuring real-time PM2.5 concentrations for residential, commercial, or industrial use. Containing a full-color LED ring, the resulting glow indicates real-time air quality at a glance, whether used indoors or out. Built-in WiFi enables the air quality monitor to transmit data to the real-time PurpleAir Map, where it is stored and made available to any smart device.

Double tap to adjust the brightness of the highly visible multi-colored LED ring, allowing quick air quality identification from across the room. Uncluttered and attractive, this indoor or outdoor monitor provides you and your family with industry-leading performance in measuring PM2.5 pollutant levels in or around your home.

For locations with limited WiFi access, the PurpleAir Zen PM2.5 measurement device incorporates real-time clock and SD card capabilities, allowing the sensor to record and store data on a microSD card.

The PurpleAir Zen features user-replaceable PMS6003 laser counters and an expansion port that allows easy swapping of the temperature sensors, and a white USB cable that blends in with the monitor and surroundings.

Please note: This sensor does not come with a power adaptor.

  • Find a suitable OUTDOOR-rated adaptor here.
  • Find a suitable INDOOR ONLY adaptor here.
  • OR use your own USB power source (any 5V, 1.2 to 2.4 amp adaptor will work)

The Zen sensor does not come with an SD card. Any card up to 64GB, class 10 or better will work, and must be formatted with a FAT32 file system. If you need a pre-formatted SD card, you can find one here.

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  • The latest PurpleAir sensor with built in full color LED ring, and a tap sensor to adjust the brightness by tapping the sensor. This one can be used indoors and out with the included desktop or wall (or pole) mount.
  • Tap sensor for adjusting LED brightness, double tap the sensor to adjust LED brightness.
  • User replaceable dual Laser Particle Counters (PMS-6003)
  • Pressure, Temperature, Humidity & Gas Sensor (BME688)
  • Built-in SD card logging and real-time clock for offline data capture
  • WiFi connectivity with data stored in the cloud
Dimensions 3.5 in x 3.5 in x 4 in
(85 mm x 85 mm x 100 mm)
Color Semi transparent
Power requirements 5V USB Micro, 0.18A continuous, 600mA peak
Intended Use Outdoor and indoor use
WiFi Yes
Expansion Port Yes
Internal Storage Yes, optional microSD
Warranty One (1) year limited warranty
Tap sensor for adjusting LED brightness, double tap the sensor to adjust LED brightness.
Manufacturer Kionix, Inc.
Model Number KX122-1037
Temperature range -40°F to 185°F (-40°C to 85°C)
Mechanical Shock (powered and unpowered) 5,000g for 0.5ms
10,000g for 0.2ms
Laser Particle Counters

Class 1 Laser. A Class 1 laser is safe under all conditions of normal use.

Manufacturer Plantower

This device contains two particle detectors to provide redundancy and help determine sensor health.

Type PMS-6003 (2)
Range of measurement 0.3, 0.5, 1.0, 2.5, 5.0, & 10 μm
Counting efficiency 50% at 0.3μm & 98% at ≥0.5μm
Effective range
(PM2.5 standard)*
0 to 500 μg/m³
Maximum range (PM2.5 standard)* ≥1000 μg/m³
Maximum consistency error (PM2.5 standard) ±10% at 100 to 500μg/m³ & ±10μg/m³ at 0 to 100μg/m³
Standard Volume 0.1 liter
Single response time ≤1 second
Total response time ≤10 seconds
Pressure, Temperature, Humidity, & Gas Sensor
Manufacturer BOSCH
Model Number BME688
Temperature range -40°F to 185°F (-40°C to 85°C)
Pressure range 300 to 1100 hPa
Humidity Response time (τ63%): 8s
Accuracy tolerance: ±3% RH
Hysteresis: ≤1.5% RH
Gas Response time (τ33-63%): <1s
Resolution: ±0.08%
Built-in SD Card Logger & Real-time Clock
Real-time Clock (RTC) DS3231
Extremely accurate I2C real-time clock
Real-time Clock Battery CR2032 3V
SD Card MicroSD card
Takes microSD cards up to 64GB
SD Card Format FAT32
SD Card Data Access Remove the microSD card by pushing it in to unlatch and then pull out with tweezers. Insert the SD card into a computer to access the csv and data files. More information on working with SD data is available here on the PurpleAir community site. We also provide a software tool to help work with this data here.

Contains Transmitter Module FCC ID: 2AC7Z-ESPWROOM02D

Wireless Networks 802.11b/g/n @ 2.4GHz
(WPA2 pre-shared key or open networks)
Certificates FCC/CE/TELEC/SRRC
Tx Power 802.11 b: +20 dBm
802.11 g: +17 dBm
802.11 n: +14 dBm
Rx Sensitivity 802.11 b: -91 dbm (11 Mbps)
802.11 g: -75 dbm (54 Mbps)
802.11 n: -72 dbm (MCS7)
Antenna Type 2 dBi on-board PCB antenna

FCC Compliance Statement (Part 15.19)

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

  1. This device may not cause harmful interference, and
  2. This device must accept any interference received, including interference that may cause undesired operation.

Warning (Part 15.21)

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

FCC Interference Statement (Part 15.105 (b))

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.

To comply with FCC/IC RF exposure limits for general population / uncontrolled exposure, the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.

Customer Reviews

Based on 41 reviews
Andrew Whiteley
Great concept. Hard to access data

I love having minute by minute air quality readings and find it fascinating how weather conditions and local environment affect it. However, the one thing that lets it down for me is having to access the data via a web page.

The constant need to log on makes it a pain to access and on a phone the screen is too small to see things clearly. It would be perfect if there was an app that stored all the data, allowed you to export it and display it clearly and also could link with other devices, either directly or via IFTTT.

Hi Andrew,

We're glad that you are enjoying the Zen and are sorry that you find accessing its data to be a barrier. We appreciate the feedback about an app. We have had similar requests, and it is definitely something that we want to do.

Richard Francis
What if

If only I could get it to connect to WiiFi!

Hi Richard,

We apologize if you've had an issue connecting your device to the internet. We do not want the setup process to be a complication for anyone. If you are still experiencing this issue, please send an email to contact@purpleair.com. We would be happy to help you troubleshoot.

Brian Reid
I sent you a review yesterday

nothing has changed

Tristan Vukosich
Second Sensor, Still Love It

I now own and operate the only 2 air sensors in my county. I had a bit of trouble getting the double-tap to adjust the brightness on this one, but I did use zip ties to mount it instead of screws like I did on the first one I purchased.

Ric Werme
Superb for data, human factors need a couple tweaks

I mounted this on a 2nd floor access door on my garage and routed the provided USB wire inside to a stray power source. It may be one of the few outdoor installations where the wire was long enough.

The LED ring is not good outside. I set it to the dimmest setting which is okay for nighttime but it's way too dim for daytime. It needs either an automatic brightness level or an option to http://purple/json interface which I use to get my local data. ("purple" is my local hostname for the monitor.)