Having had the opportunity to get the AirGradient Open Air (Model O-1PST) at the ASIC 2025 conference in Thailand, complete with its unique engraving, I’ve spent some time with this device, and it’s clear that AirGradient is pushing the boundaries of accessible and reliable outdoor air quality monitoring. This device presents a compelling alternative to existing solutions, particularly for those seeking transparency and robust performance.

Technical Specifications O-1PST

• WiFi 2.4GHz IEEE 802.11 b/g/n-compliant
• Bluetooth LE: Bluetooth 5, Bluetooth mesh
• Status LED
• Plantower PMS5003T for PM2.5 + ENS210 for T/RH
• SenseAir S8/S88 CO2 NDIR Sensor
• Sensirion SGP41 TVOC/NOX Module
• Enclosure: ASA Plastic, UV Resistant and Weather Proof
• Mounting Options: Wall or pole mounting options
• 4m USB-C to USB-A Cable
• USB-C Power Connector 2A/5V
• Certifications: CE, RoHS, REACH, FCC

Sensor Selection: A Thoughtful Approach

The Open Air features a well-considered suite of sensors designed for accurate and insightful data. For PM2.5 measurements, it utilizes the Plantower PMS5003T, a sensor known for its reliability and found in other popular monitors like the PurpleAir (though it’s important to note the PMS5003T is a similar but not identical variant).

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