Environmental Data

Air quality

_airq-AirQuality.tsv

This file contains air quality data measured by the AirQ device in participants’ homes. The device is placed in the room where participants spend most of their time. The data covers the 24 hours prior to MRI acquisition. The sampling interval is ~120 seconds.

ID of the subject.

timestamp

Timestamp of the data point displayed as date, time and timezone in ISO 8601 format.

uptime

This is the runtime of the device in seconds.

status

Indicates if e.g. a warm-up phase is running for individual sensors etc.

dHdt

First derivative of absolute humidity with reference to time in mg/m³s.

dCO2dt

First derivation of CO2 concentration with reference to time in ppb/s.

health

Healthcare Index in ‰. Detailed information can be found on the air-Q website.

performance

Performance Index in ‰. Detailed information can be found on the air-Q website.

voc

Volatile Organic Compounds (VOC) value in ppb.

voc_e

Volatile Organic Compounds (VOC) value error in ± ppb.

Note

The error values are absolute and should be either added to or subtracted from the measured value.

co2

Carbon dioxide in ppm.

co2_e

Carbon dioxide error in ± ppm.

oxygen

Oxygen in %.

oxygen_e

Oxygen error in ±%.

Carbon monoxide in mg/m³.

co_e

Carbon monoxide error in ± mg/m³.

Ozone in µg/m³.

o3_e

Ozone error in ± µg/m³.

pm1

Particulate matter PM1 in µg/m³.

pm1_e

Particulate matter PM1 error in ± µg/m³.

pm2_5

Particulate matter PM2,5 value in µg/m³.

pm2_5_e

Particulate matter PM2,5 value error in ± µg/m³.

pm10

Particulate matter PM10 in µg/m³.

pm10_e

Particulate matter PM10 in ± µg/m³.

cnt0_3

Particles total number with size > 0.3 µm.

cnt0_3_e

Particles total number with size > 0.3 µm error.

cnt0_5

Particles total number with size > 0.5 µm.

cnt0_5_e

Particles total number with size > 0.5 µm error.

cnt1

Particles total number with size > 1 µm.

cnt1_e

Particles total number with size > 1 µm error.

cnt2_5

Particles total number with size > 2.5 µm.

cnt2_5_e

Particles total number with size > 2.5 µm error.

cnt5

Particles total number with size > 5 µm.

cnt5_e

Particles total number with size > 5 µm error.

cnt10

Particles total number with size > 10 µm.

cnt10_e

Particles total number with size > 10 µm error.

typPS

Average particle size in µm.

temperature

Temperature in °C.

temperature_e

Temperature error in ± °C.

humidity

Humidity in %.

humidity_e

Humidity error in ± %.

humidity_abs

Humidity absolute in g/m³.

humidity_abs_e

Humidity absolute error in ± g/m³.

dewpt

Dew point in °C.

dewpt_e

Dew point error in ± °C.

pressure

Atmospheric pressure in hPa.

pressure_e

Atmospheric pressure error in ± hPa.

no2

Nitrogen dioxide in µg/m³.

no2_e

Nitrogen dioxide error in ± µg/m³.

so2

Sulfur dioxide in µg/m³.

so2_e

Sulfur dioxide error in ± µg/m³.

h2s

Hydrogen sulfide in µg/m³.

h2s_e

Hydrogen sulfide error in ± µg/m³.

sound

Noise in dB(A).

sound_e

Noise error in ± dB(A).

sound_max

Maximum noise value within 2 minutes in dB(A).

sound_max_e

Error in maximum noise value within 2 minutes in ± dB(A).

_atmotube-AirQuality.tsv

This file contains air quality data measured by the Atmotube device that participants carry with them. We extract the data from the Atmotube app that stores the data locally on the participants’ study phone. The data covers the 24 hours preceding MRI acquisition. The sampling interval is ~60 seconds.

ID of the subject.

sessionNo

This is the session number.

timestamp

Timestamp of the data point displayed as date, time, and timezone in ISO 8601 format.

voc

Volatile Organic Compounds (VOC) value in ppb.

aqs

Air quality score (AQS).

AQS Calculation
State of the Air	Air Quality Score	PM1 (µg/m³)	PM2.5 (µg/m³)	PM10 (µg/m³)	VOC (ppm)
Good	81 - 100	0 - 14	0 - 20	0 - 30	0 - 0.3
Moderate	61 - 80	14 - 34	20 - 50	30 - 75	0.3 - 1
Polluted	41 - 60	34 - 61	50 - 90	75 - 125	1 - 2.5
Very Polluted	21 - 40	61 - 95	90 - 140	125 - 200	2.5 - 5.5
Severely Polluted	0 - 20	95 - 100	140 - 170	200 - 250	>5.5

temperature

Temperature in °C.

humidity

Humidity in %.

pressure

Atmospheric pressure in hPa.

pm1

Particulate matter PM1 in µg/m³.

pm2_5

Particulate matter PM2.5 value in µg/m³.

pm10

Particulate matter PM10 in µg/m³.

GPS location

_gpsTracker-24hGPS.tsv

This file contains location data recorded by the GPS-Tracker Pro app. The app is installed on the provided study phone that tracks participants’ locations during the pre-scan periods. The data covers the 24 hours preceding MRI acquisition. The sampling interval is irregular, varying with participant movement and signal quality.

ID of the subject.

sessionNo

This is the session number.

timestamp

Timestamp of the data point displayed as date, time and timezone in ISO 8601 format.

latitude

Latitude of location.

longitude

Longitude of location.

altitude

Altitude of location.

horizontalAccuracy

Estimated precision of the latitude and longitude measurement. It represents the radius (in meters) of a circle (centered on the given GPS location) within which the true location is expected to be.

verticalAccuracy

Estimated precision of the altitude measurement in meters.

_gpsTracker-alldpGPS.tsv

This file contains location data recorded by the GPS-Tracker Pro app, which is installed on the provided study phone. The app tracks participants’ locations during the pre-scan periods. Unlike the _gpsTracker-24hGPS.tsv file, which only includes data from the 24 hours prior to MRI acquisition, this file contains all recorded data points — from the moment a new track is started in the app until the track is stopped. The sampling interval is irregular, varying with participant movement and signal quality.

Note

This data is also available in GPX and KML format:

_gpsTracker-alldpGPS.gpx
_gpsTracker-alldpGPS.kml

ID of the subject.

timestamp

Timestamp of the data point displayed as date, time and timezone in ISO 8601 format.

latitude

Latitude of location.

longitude

Longitude of location.

altitude

Altitude of location.

horizontalAccuracy

Estimated precision of the latitude and longitude measurement. It represents the radius (in meters) of a circle (centered on the given GPS location) within which the true location is expected to be.

verticalAccuracy

Estimated precision of the altitude measurement in meters.

within24h

0 = Data point is not within the pre-scan period

1 = Data point is within the pre-scan period

_brainscape-24hGPS.tsv

This file contains location data recorded by the custom-made BrainScape app, which is installed on the provided study phone. The data covers the 24 hours preceding MRI acquisition. The sampling interval is irregular, varying with participant movement and signal quality.

ID of the subject.

sessionNo

This is the session number.

timestamp

Timestamp of the data point displayed as date, time and timezone in ISO 8601 format.

longitude

Longitude of location.

latitude

Latitude of location.

_brainscape-ContinousGPS.tsv

This file contains location data recorded by the custom-made BrainScape app installed on participants’ personal phones. The data encompasses the entire study period, starting with the first testing session and ending after the final (25th) session. The sampling interval is irregular, varying with participant movement, signal quality, and participant reliability.

ID of the subject.

timestamp

Timestamp of the data point displayed in ISO 8601 format including timezone in ISO 8601 format.

longitude

Longitude of location.

latitude

Latitude of location.

Environmental audio exposure

_appleHealth-EnvironmentalAudioExposure.tsv

This file contains noise data recorded by the Apple Watch that participants carry with them. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition. The sampling interval is ~1800 seconds.

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Sound pressure level in decibels.

_brainscape-EnvironmentalAudioExposure.tsv

This file contains noise data recorded by the study phone. The noise level is measured during the completion of the BrainScape questionnaire.

ID of the subject.

sessionNo

This is the session number.

timestamp

Timestamp of the data point displayed as date, time and timezone in ISO 8601 format.

ambientNoise

Sound pressure level in A-weighted decibels (dBA).

Light exposure

_lightWatcher-Illuminance.tsv

This file contains illuminance data recorded by the Light Tracker that participants carry with them. We extract the data from the device. The data covers the 24 hours preceding MRI acquisition. The sampling interval is ~10 seconds.

ID of the subject.

sessionNo

This is the session number.

timestamp

Timestamp of the data point displayed in ISO 8601 format including timezone in ISO 8601 format.

light_lux

Illuminance in lux

light_ir

Irradiance infrared in milliWatt per square metre per nanometre (mW/m²/nm)

light_red

Irradiance red in milliWatt per square metre per nanometre (mW/m²/nm)

light_green

Irradiance green in milliWatt per square metre per nanometre (mW/m²/nm)

light_blue

Irradiance blue in milliWatt per square metre per nanometre (mW/m²/nm)

light_uv

Irradiance ultraviolet in milliWatt per square metre per nanometre (mW/m²/nm)

temperature

Temperature in Celsius.

acceleration_x

Acceleration in x-direction in m/s².

acceleration_y

Acceleration in y-direction in m/s².

acceleration_z

Acceleration in z-direction in m/s².