General Parameters

Understanding what each data field in the CSV export represents is essential for accurately interpreting your data from the AirGradient dashboard export.

Parameter Name (unit)	Description	Why it's measured this way and what the unit means	Time Resolution	References from AirGradient Blog	Other References
PM2.5 (µg/m3) raw	Raw, uncorrected, mass concentration of airborne particles with diameter <= 2.5 µm.	Mass (µg/m3) represents the total weight of inhalable particles in air.	1-min (Wi-Fi), 3-min (Cellular)
PM 0.3µm particle count	Count of all airborne particles with a diameter equal to or larger than 0.3 µm, measured as number concentration.	Particle count tracks the number of particles, regardless of mass. Small particles can be high in number but low in mass, so count reveals pollution events mass-based PM may miss.	1-min (Wi-Fi), 3-min (Cellular)
CO2 (ppm) raw	Carbon dioxide concentration in the air.	PPM (parts per million) reflects volumetric gas concentration. Standard unit for tracking CO2 buildup from human activity.	1-min (Wi-Fi), 3-min (Cellular)
Temperature (°C) raw	Ambient temperature near the sensor.	Temperature in °C is a direct physical measure affecting comfort and sensor behavior. For our indoor monitor, the raw temperature reflects ambient room temperature well. For our outdoor monitors, the raw temperature diverges from ambient because the sensor sits inside the insulated casing of the monitor. Therefore, we apply a temperature and humidity correction (shown as corrected values later in the sheet, refer to Temperature (°C) corrected).	1-min (Wi-Fi), 3-min (Cellular)	AirGradient Education Webinar: Temperature and Relative Humidity Correction
Humidity (%) raw	Ambient relative humidity near the sensor.	% RH indicates water vapor content relative to air saturation. Affects sensor function and air quality. For our outdoor monitors, the raw temperature diverges from ambient because the sensor sits inside the insulated casing of the monitor. Therefore, we apply a temperature and humidity correction (shown as corrected values later in the sheet, refer to Humidity (%) corrected).	1-min (Wi-Fi), 3-min (Cellular)	AirGradient Education Webinar: Temperature and Relative Humidity Correction
TVOC (ppb)	Total concentration of volatile organic compounds converted to ppb using Sensirion (sensor manufacturer) conversion formula.	Reported in ppb but calculated using Sensirion's conversion formula from VOC index. This is not an absolute concentration but a relative estimate based on sensor response, useful for trend comparison.	1-min (Wi-Fi), 3-min (Cellular)	How Accurate is the Sensirion SGP41 TVOC Sensor?	Compliance of Sensirion's VOC Sensors with Building Standards Related to All Sensirion Products with a VOC Index Output
TVOC index	Scaled index value representing total VOC activity, based on sensor signal relative to recent baseline. 100 = baseline, higher values indicate increased TVOC concentration, lower values indicate a reduction of TVOCs.	Unitless index (1 - 500) based on deviation from 24h baseline. 100 = baseline, >100 = more VOCs present compared to the 24-hour baseline, <100 = fewer VOCs compared to the 24-hour baseline. Index is used because MOx sensors respond broadly to many VOCs, making exact ppb estimates unreliable. Better for detecting relative changes in air quality. The VOC Index adapts its gain based on environment: in clean air it becomes more sensitive to small changes, and in polluted air, it reduces sensitivity to avoid saturation, ensuring relative changes remain meaningful.	1-min (Wi-Fi), 3-min (Cellular)	TVOC - When it's useful and when it's useless	What is Sensirion's VOC Index?
NOX index	Scaled index value representing NOx activity, where 1 = baseline and higher values indicate increased NOx.	Unitless index (1 - 500) based on deviation from 24h baseline. 1 = baseline, >1 = more oxidizing gases present. The NOx Index does not include gain adaptation, as NOx events are typically more consistent in composition.	1-min (Wi-Fi), 3-min (Cellular)		What is Sensirion's NOx Index?
PM1 (µg/m3)	Mass concentration of particles with diameter <= 1 µm.	Approximate mass concentration of particles smaller than 1 µm. µg/m3 provides a standard mass-based metric for fine particulate pollution.	1-min (Wi-Fi), 3-min (Cellular)	They Add More Pollutants; We Add More Accuracy. Why We're Stepping Back from PM1 and PM10 Marketing
PM10 (µg/m3)	Mass concentration of particles with diameter <= 10 µm.	Approximate mass concentration of particles smaller than 10 µm. Plantower sensors are optimized for PM2.5, making PM10 values less reliable. Larger particles such as pollen (>10 µm) are generally not detected. µg/m3 gives weight of larger respirable particles like dust per air volume.	1-min (Wi-Fi), 3-min (Cellular)	They Add More Pollutants; We Add More Accuracy. Why We're Stepping Back from PM1 and PM10 Marketing
TVOC raw log(R)	Logarithmic value of raw resistance output from the VOC sensor.	Reflects electrical resistance of the MOx sensor surface. A MOx sensor consists of a heated metal oxide that changes resistance with oxygen interaction. Reducing gases (like VOCs) lower resistance, oxidizing gases increase it. Output is broadband and non-specific.	1-min (Wi-Fi), 3-min (Cellular)	How Accurate is the Sensirion SGP41 TVOC Sensor?	What is a metal oxide (MOX) sensor?
NOX raw log(R)	Logarithmic value of raw resistance output from the NOx sensor.	Value shows MOx resistance change in presence of oxidizing gases. Heated metal oxide gains resistance when exposed to NOx. Output reflects general oxidizing gas presence, not specific concentrations.	1-min (Wi-Fi), 3-min (Cellular)		What is a metal oxide (MOX) sensor?
PM2.5 (µg/m3) corrected	Calibrated PM2.5 value adjusted using the calibration formula chosen in the dashboard.	Corrections may improve accuracy by accounting for various environmental or sensor-specific factors.	1-min (Wi-Fi), 3-min (Cellular)
CO2 (ppm) corrected	Calibrated CO2 value adjusted using the calibration formula chosen in the dashboard.	Corrections may improve accuracy by accounting for various environmental or sensor-specific factors.	1-min (Wi-Fi), 3-min (Cellular)
Temperature (°C) corrected	Temperature reading adjusted using the calibration formula chosen in the dashboard.	Corrections may improve accuracy by accounting for various environmental or sensor-specific factors.	1-min (Wi-Fi), 3-min (Cellular)
Humidity (%) corrected	Relative humidity adjusted using the calibration formula chosen in the dashboard.	Corrections may improve accuracy by accounting for various environmental or sensor-specific factors.	1-min (Wi-Fi), 3-min (Cellular)
Heat Index (°C)	Calculated heat index combining corrected temperature and humidity readings into a perceived temperature.	The heat index, also known as the apparent temperature, is a measure of how hot it really feels when relative humidity is combined with the air temperature.	1-min (Wi-Fi), 3-min (Cellular)
Location ID	The location ID automatically assigned to the location in the dashboard.
Location Name	The location name assigned to the location in the dashboard by the user.
Location Group	The location group assigned to the location in the dashboard.
Location Type	Indicates whether the location is indoor or outdoor.
Sensor ID	A combination of the monitor SN and the maker.
Local Date/Time	Date and time information in the local timezone.
UTC Date/Time	Date and time information in Universal Coordinated Time.
Channel	PM readings of monitors with two PM modules are distinguished this way. "1" stands for PM module 1; "2" stands for PM module 2; and "-" provides the average of both modules.
# of aggregated records	At lower time resolutions (for example 5 min, 1 hour, etc.), this indicates how many data points went into the average.
Place Open	Indicates if the place was open when the data was captured or closed as configured in the dashboard.

Understanding measure0 through measure19

Some CSV exports include columns named measure0 through measure19. These are flexible fields used for data that is specific to a monitor model or an optional sensor configuration. The same column can therefore represent different data for different models.

Use the monitor model shown in the export to interpret these columns. A blank field does not necessarily indicate a fault. It can mean that the field is not used by that model, the optional measurement is not enabled, or no valid value was available for that measurement period.

AirGradient Go (P-1PSG)

CSV column	AirGradient Go value	Unit or format
measure0	Barometric pressure	hPa
measure1	GPS latitude	Decimal degrees
measure2	GPS longitude	Decimal degrees
measure3	GPS altitude	m
measure4	GPS speed	m/s
measure5	GPS horizontal dilution of precision (HDOP)	Unitless
measure6	Motion	Monitor-reported value
measure7	Route identifier	Number
measure8-measure19	Currently unused	-

GPS-related fields can be blank when GPS is set to Always Off, when the monitor does not have a GPS fix, or when a value was not available during the exported period.

AirGradient Open Air Max with/without NO2/O3 (O-M-1PPSTON-CE, O-M-1PPST-CE)

The O-M-1PPSTON-CE is the Open Air Max model equipped with NO2 and O3 sensors. The O-M-1PPST-CE model does not use measure0 through measure6 for these measurements.

CSV column	Open Air Max value	Unit or format
measure0	O3 working electrode	mV
measure1	O3 auxiliary electrode	mV
measure2	NO2 working electrode	mV
measure3	NO2 auxiliary electrode	mV
measure4	Analogue front-end (AFE) temperature	Monitor-reported value
measure5	Calculated O3	ppb
measure6	Calculated NO2	ppb
measure7	PM0.5 particle count, when included in the PM-bin data	Particles per dL
measure8	PM1 particle count, when included in the PM-bin data	Particles per dL
measure9	PM2.5 particle count, when included in the PM-bin data	Particles per dL
measure10	PM5 particle count, when included in the PM-bin data	Particles per dL
measure11	PM10 particle count, when included in the PM-bin data	Particles per dL
measure12	Standard-particle PM2.5 mass average	µg/m3
measure13-measure19	Currently unused	-

AirGradient ONE (I-9PSL-DE, I-9PSL-DE-CE) and AirGradient Open Air (O-1PST, O-1PST-CE)

For AirGradient ONE and Open Air monitors, the flexible fields are used for extended PM measurements. These measurements are available when extended PM measures are enabled for the dashboard by request. The exact fields populated depend on the PM sensor and monitor configuration.

CSV column	Extended PM value	Unit or format
measure0-measure6	Unused	-
measure7	pm005Count: particles with a diameter of 0.5 µm or larger	Particles per dL
measure8	pm01Count: particles with a diameter of 1.0 µm or larger	Particles per dL
measure9	pm02Count: particles with a diameter of 2.5 µm or larger	Particles per dL
measure10	pm50Count: particles with a diameter of 5.0 µm or larger. Available for AirGradient ONE, but not Open Air.	Particles per dL
measure11	pm10Count: particles with a diameter of 10 µm or larger. Available for AirGradient ONE, but not Open Air.	Particles per dL
measure12	pm02Standard: PM2.5 standard-particle mass concentration	µg/m3
measure13-measure19	Currently unused	-

The particle-count thresholds are cumulative. For example, pm02Count counts particles with a diameter of 2.5 µm or larger; it is not limited to particles between 1.0 and 2.5 µm.

PM5 and PM10 particle-count data is available only from the Plantower PMS5003 used in AirGradient ONE and Open Air Max. The AirGradient Open Air uses the Plantower PMS5003T, which does not provide these two particle-count measurements.

For instructions on exporting the file and choosing its date range and resolution, see How to Export Data from the AirGradient Dashboard.