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Air quality sensor

Square Air

The all-in-one indoor air quality sensor: a gas sensor that reads how the air actually behaves, with temperature, humidity, pressure and light in one 58 mm square.

Square Air is built around a metal-oxide gas sensor that detects a broad mix of volatile organic compounds from materials, activities and people. From it the sensor derives an indoor air quality index (IAQ), a breath-VOC value and a CO₂ equivalent, alongside ±0.2 °C temperature, humidity, barometric pressure and ambient light.

That makes it a better guide to ventilation than a CO₂ number alone. It also senses smoke, though it is not a certified fire alarm. The CO₂ value is an estimate derived from breath-related gases; for measured CO₂ there is Square CO2 in the same housing. The 6,000 mAh battery lasts about 6–7 years with continuous measurement, and about 12 years when it measures in extended office hours only (06:00–20:00, Monday to Friday). Mount with the integrated adhesive or the optional screw kit.

Sensors
IAQ index, bVOC and CO₂ equivalent (gas sensor), temperature, humidity, air pressure, ambient light
Temperature accuracy
±0.2 °C
Humidity accuracy
±3 % RH
Light range
1–65,000 lux
Protocol
LoRaWAN 1.0.4, Class A, OTAA
Frequency
EU868 · US915 · AU915 · AS923-1 · AS923-2 · KR920 · IN865
Configuration
NFC (Android) and over the air; alternative VSM apps through the Hugin app or over LoRaWAN
Positioning
2.4 GHz Wi-Fi geopositioning via cloud service
Battery
Built-in LiMnO₂, 6,000 mAh: about 6–7 years measuring continuously, about 12 years measuring 06:00–20:00 Mon–Fri
IP rating
IP30, indoor
Operating temp
–20 to +60 °C
Dimensions
58 × 58 × 15 mm
Weight
65 g
Mounting
Adhesive, or optional screw mounting kit
  • How air actually behaves: The gas sensor picks up the VOCs a CO₂ sensor misses, from cleaning agents, materials and people.
  • Air quality, climate and light in one device: IAQ, bVOC, CO₂ equivalent, temperature, humidity, pressure and light.
  • Ventilation on evidence: Drive ventilation from air quality instead of the clock, with one rule in Yggio.
  • Square screw mounting kit: Deux plaques adhésives pour visser n’importe quel capteur Square là où l’adhésif ne suffit pas — derrière l’appareil ou à côté. Détails