Measurement summary

Parameter	Hardware
PM1.0, PM2.5, PM10 mass concentration	Sensirion SPS30
CO2	SenseAir S12
TVOC index, NOx index, and raw SGP41 values	Sensirion SGP41
Temperature and relative humidity	Sensirion SHT40
Barometric pressure and pressure-based altitude estimate	Infineon DPS368
GPS location data	Allystar TAU1113
Movement/orientation	STMicroelectronics LIS2DH12

More details: AirGradient Go: Technical Specifications.

How readings appear

You can view AirGradient Go data in three ways:

1. On the monitor: The display shows readings when you use the Go on its own. No phone or dashboard connection is required.

2. In the AirGradient app: In Portable mode, the app connects to the Go over Bluetooth and shows current readings. Pair the monitor with the app using Pair AirGradient Go With the AirGradient App.

3. In the AirGradient Dashboard: There are two dashboard paths:

   • In Portable mode, the Go sends readings over Bluetooth to the phone. The app can then upload those readings to the dashboard when Stream data to server is enabled in Configure My Monitor. The app continues to show current readings, while the dashboard stores the uploaded data.

   • In Stationary mode, the Go connects to WiFi and sends readings directly to the dashboard. This is the dashboard-only path; the app is not used as the data relay. See Connect AirGradient Go to WiFi.

If a sensor is warming up, or a reading is invalid or unavailable, it may be shown as a dash or blank.

PM1.0, PM2.5, and PM10

PM means particulate matter: small airborne particles such as smoke, dust, combustion particles, and other aerosols.

AirGradient Go reports three particle-size groups:

Reading	Meaning
PM1.0	Particles with an approximate diameter of 1.0 micrometer or smaller
PM2.5	Fine particles with an approximate diameter of 2.5 micrometers or smaller
PM10	Particles with an approximate diameter of 10 micrometers or smaller

The monitor uses a Sensirion SPS30 particulate matter sensor. It estimates particle concentration using light scattering: air passes through the sensor, particles scatter light, and the sensor converts that signal into particulate readings.

The main display focuses on PM2.5 because it is the most accurate PM metric commonly used for health guidance and AQI calculations. PM readings are reported as mass concentration in micrograms per cubic meter (ug/m3) or as USAQI when that display mode is selected.

PM readings can change quickly when the monitor is near smoke, cooking, dust, traffic, or other local particle sources. Avoid blocking the sensor inlet or placing the monitor deep inside a bag when you want representative readings.

CO2

CO2 means carbon dioxide. AirGradient Go reports CO2 in parts per million (ppm).

CO2 is useful for understanding ventilation in occupied spaces. It usually rises when people breathe in an enclosed area and ventilation is limited. Outdoor CO2 is typically much lower than crowded or poorly ventilated indoor spaces.

AirGradient Go measures CO2 with a SenseAir S12 CO2 sensor.

For calibration guidance, see AirGradient Go: CO2 Readings and Calibration.

TVOC index

TVOC means total volatile organic compounds. These are gases that can come from sources such as solvents, cleaning products, paints, adhesives, smoke, personal-care products, cooking, and many indoor materials.

AirGradient Go uses a Sensirion SGP41 gas sensor for TVOC-related readings.

The normal TVOC value is an index, not a direct concentration in ppb or mg/m3. The index is designed to show changes in VOC conditions over time. A higher index means the sensor is detecting a stronger VOC-related signal compared with its recent baseline.

Use TVOC index trends rather than treating a single number as an exact chemical concentration. The sensor does not identify which VOC is present.

Learn more about this sensor here: Explaining VOCs, TVOC and the VOC Index

NOx index

NOx means nitrogen oxides. NOx-related signals can be associated with combustion sources such as traffic, gas appliances, burning, and other outdoor or indoor combustion events.

AirGradient Go uses the same Sensirion SGP41 gas sensor for NOx-related readings.

The normal NOx value is also an index, not a direct concentration in ppb. It is useful for seeing changes and trends, but it does not identify a specific gas or provide a regulatory-grade concentration.

More detail: Why the SGP41 Can't Measure Ambient NOx

TVOC and NOx in Offline mode

In Portable and Stationary modes, AirGradient Go can calculate TVOC and NOx index values from the SGP41.

In Offline / Airplane Mode, the monitor shows raw SGP41 values instead of TVOC and NOx index values because the continuous gas-index calculation is not maintained across deep-sleep cycles.

If you need TVOC and NOx index values, use Portable or Stationary mode where possible.

Temperature and humidity

AirGradient Go measures temperature and relative humidity with a Sensirion SHT40 sensor.

Temperature is shown in Celsius or Fahrenheit depending on the monitor setting. Humidity is shown as relative humidity in percent.

These readings describe the air near the monitor. They can be affected by:

• direct sun
• body heat from carrying the monitor
• warm electronics nearby
• rain, condensation, or very humid air around the enclosure
• airflow around the monitor

Allow the monitor to adjust after moving it between environments.

Barometric pressure and altitude estimate

AirGradient Go measures barometric pressure with an Infineon DPS368 pressure sensor.

Pressure is reported in hectopascals (hPa). The monitor can also derive a pressure-based altitude estimate.

The altitude estimate is based on air pressure, not GPS. It can change when weather systems change local pressure, even if the monitor has not moved. For route location altitude, GPS altitude may also be available when GPS has a fix.

GPS location and time

AirGradient Go uses an Allystar TAU1113 GPS module.

When GPS has a fix, the monitor can use or store:

• latitude
• longitude
• GPS altitude
• fix type
• satellite count
• GPS timestamp

GPS data is mainly used for route tracking and location-aware records. A route can start before GPS has a fix, but route points include location data only after a fix is available.

The GPS fix icon appears in the top status bar when a usable GPS position is available. It looks like a small upward caret or open triangle (/\). If the icon is not shown, move outdoors with a clearer view of the sky and wait for GPS.

For more detail, see AirGradient Go GPS and Route Tracking and AirGradient Go: GPS Fix Troubleshooting.

Motion and orientation

AirGradient Go includes an STMicroelectronics LIS2DH12 accelerometer.

The accelerometer is used for monitor features and diagnostics that need movement or orientation input. It is not an air-quality measurement, and it is not a replacement for GPS route position.

Battery and charging status

AirGradient Go includes a 2000 mAh Li-Po battery and power-management hardware.

Power-related values can include:

• battery percentage
• battery voltage
• charging voltage
• charging state
• whether the monitor is plugged in

Battery readings help explain runtime and charging behavior. They are also stored with route data so you can understand the monitor state during a session.

For display units and measurement interval settings, see AirGradient Go: Settings.

Questions or feedback?

If anything on this page is unclear, or if you have suggestions for how we can improve this guide, please leave a comment below.

You can also contact us through our support form here: Contact Support