The PurpleAir Classic Plus is an updated version of our popular classic monitor.
Using exactly the same components and structure as the Classic with one change: A new internal bracket to make replacing the laser counters easy.
Designed for outdoor use, this monitor is perfect for residential, commercial, or industrial users looking for a reliable way to collect real-time PM2.5 AQI data. Connect it to WiFi to transmit that data to the interactive map, which is accessible by any smart device.
This model is also available with offline data collection capabilities via an SD logger — offered as the Classic SD Plus (with SD storage)
NOTICE: Power supply NOT included; find a suitable option here.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
This device may not cause harmful interference, and
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.
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.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
This device may not cause harmful interference, and
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.
It always says “20”. Always.
I live in a farming community with a lot of dust… And near a PennDot storage facility. I would think it would change from time to time.
Hi Laurie,
That is interesting behavior. We'd like to take a look at your sensor's readings. If you don't mind, please send an email to contact@purpleair.com.
M
Michelle Rogge
Easy & Accurate
This was so easy to install and get online. Gave us real time data for the school to make decisions about outdoor events during wildfire season. My only questions is - why didn't we do this many years ago!!!
J
Joe
Reliable and accurate
I’m satisfied with this air quality monitor. It provides reliable and accurate values to keep me and others safe from harmful air.
L
Larry K
PurpleAir Classic + Air Monitor ordered and installed Hoodsport WA
Purchased this to install at our beach place and monitor smoke from a major forest fire about 12 miles away (Sept. 2025) Wife has asthma, and we don't want to be in the area when the air quality is unsafe for her.
The PurpleAir + monitor seems to track relatively close to another maintained by the DNR and is about a mile from our vacation home.
The only issues I ran into was getting it online and registered. Instructions were not real clear, but I eventually figured it out without calling for help.
P
Paula Camacho
Purchased Purple Air Monitors, City of Austin - Great Experience!!!
Hello, I started a dialogue to ensure our purchase was free of sales taxes, as a government entity. We have purchased these monitors before through another vendor and the experience was painful. I'm so glad we opted to purchase directly through this vendor. My entire experience has been 5 Stars. Communication, response, professional and very positive experience overall.
