The device supports several History Modes, which determine the level of detail stored in historical logs. Depending on the selected mode, the device records standard environmental metrics, expanded particulate matter (PM) data, enhanced GPS information, or both.
1. Default Mode
Records the standard set of environmental, atmospheric, and device-state parameters.
Suitable for general monitoring and typical reporting scenarios.
The Default mode includes the following parameters:
AQS
PM1.0 (µg/m³)
PM2.5 (µg/m³)
PM10 (µg/m³)
Temperature (°C / °F)
Humidity (%)
Pressure (hPa / inHg / kPa / mmHg)
TVOC Index
TVOC (µg/m³/ ppm)
NOx Index
CO2 (ppm)
Latitude
Longitude
Altitude (m)
Position Error (m)
Battery (%)
Charging (yes / no / cd) cd - "Cool down" time after charging
Motion (yes / no)
Phone GPS (yes)
User Notes (If a note is added, the note text is displayed)
2. Extended PM Mode
Adds detailed particulate matter measurements to the default dataset.
This mode is intended for applications that require advanced PM profiling.
Additional PM fields included:
PM0.5 (particles)
PM1.0 (particles)
PM2.5 (particles)
PM10 (particles)
Typical particle size (nm)
Values represent the number of particles per unit volume for each particle-size category. Unlike the standard PM measurements expressed in µg/m³ (mass concentration), the “particles” metrics describe particle count concentration — how many individual particles of each size range were detected.
3. Extended GPS Mode
Adds high-resolution GNSS/GPS metrics to the default dataset.
Additional GPS fields included:
GNSS SNR 0–19
GNSS SNR 20–49
GNSS SNR 50–99
GNSS SNR Avg
Satellites Fixed
Satellites in View
When your device (like a smartphone or Atmotube) determines your location, it relies on signals from satellites (GPS, GLONASS, etc.), collectively known as GNSS (Global Navigation Satellite System).
The terms you see—like GNSS SNR 0–19 and GNSS SNR Avg—are simply a way to measure the quality and reliability of those satellite signals.
What is GNSS SNR?
GNSS SNR tells you how strong the satellite's signal is compared to the surrounding electronic noise. A higher number means a clearer, more reliable signal, and therefore, a more accurate location fix.
4. Extended PM + GPS Mode
Description:
Provides the full dataset, combining all extended PM metrics and all extended GPS metrics.
This mode delivers the highest level of detail and is suitable for research, environmental field studies, and advanced air-quality mapping.
Includes:
All Extended PM fields
All Extended GPS fields