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General Description

The particle sensor C1 in Cair detects the dust particle concentration in air and has the ability to distinguish small particles (approx 1~2 µm) from large particles (approx 3 ~10 µm). It is not capable of measuring specific particle size/weight, instead it measures the particle concentration of a given size range in particles per cubic foot (pcs/ft3). Cair also measures Volatile Organic Compounds (VOC) (ppm), ambient air temperature (in degrees C) and relative humidity (%).

Principle of Operation

The Cair PM sensor is a particle counter where laser beams detect particles going past by their reflectivity.


  • Dimensions: 140(L) x 80(W) x 50(D) mm
  • Weight: 5oz/150g
  • Battery: No
  • Power supply: Yes ( USB 5V)
  • Sensor lifetime: N/A
  • Clock function: N/A
  • Sampling mechanism: Fan
  • Environmental operating conditions: N/A
  • Internal data logging: No
  • Data communication and logging: WiFi 802.11/g/n @2.4 GHz - with data updates every 1 minute, connects to Amazon Alexa app
  • LED traffic light feedback (Green - Good, Red - Bad)
  • Data visualization: No
  • Weatherproof: No


  • Indoor Air Quality

Developer's product webpage

    South Coast Air Quality Management District

    21865 Copley Dr, Diamond Bar, CA 91765



    © 2024 South Coast Air Quality Management District