PurpleAir PA-I-Indoor
PurpleAir PA-I-Indoor
PurpleAir PA-I-Indoor
The PA-I-Indoor is PurpleAir's indoor air quality sensors measure particulate matter (PM).

PurpleAir PA-I-Indoor

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With the PA-I-Indoor PM 2.5 sensor’s full-color LED, the resulting glow indicates air quality at a glance from across the room. Sporting a simple design that sits comfortably on a counter or tabletop, the PA-I-Indoor detector measures real-time PM2.5 concentrations. Built-in WiFi enables the PM2.5 indoor air quality sensor to transmit data to the PurpleAir map, where it is stored and made available to any smart device. 

Dimensions 4.25 in x 3 in x 2.25 in
(108 mm x 67 mm x 57 mm)
Color Translucent white with real-time AQI colored LED light
Intended Use Indoor use only
WiFi Yes
Internal Storage No
Warranty One (1) year limited warranty
Dimensions 4.25 in x 3 in x 2.25 in
(108 mm x 67 mm x 57 mm)
Sensor weight 6.4 oz (181 g)
Power supply length 3.2 ft (1 m)
Color Translucent white with real-time AQI colored LED light
Power Supply
A/C input 100-240V AC, 50/60Hz, 1.5A
A/C output 5V DC, 3A
Sensor input 5V DC, 0.18A continuous, 600mA peak
Weather resistance Indoor use only
Plug type 2 Pins, Type A (USA)

Contains Transmitter Module FCC ID: 2AC7ZESPWROOM02

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.

Laser Particle Counters

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

Type (1) PMS1003
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 Litre
 Single response time ≤1 second
 Total response time ≤10 seconds
Pressure, Temperature, & Humidity Sensor
Type BME280
Temperature range -40°F to 185°F (-40°C to 85°C)
Pressure range 300 to 1100 hPa
Humidity Response time (τ63%): 1 s
Accuracy tolerance: ±3% RH
Hysteresis: ≤2% RH