The example template given below contains the metadata fields that are commonly included when reporting data related to this specific template. Some of these metadata elements may not be relevant for your data reporting, like AIRS station ID for stations outside North America or the various QA measure data when there is no QA measure for the data. Such metadata elements could be let out. If you want to include additional metadata elements that are not given in the example template, there is a complete list here.  In case of any doubt about such additional metadata, please consult the EBAS team!

Template for Mercury in air or aerosols (draft)

This format should be used for submitting all relevant mercury species measured in gas phase and/or in aerosols

Points to note

  • Be careful in choosing the right component name and matrix combinations depending on your measurement procedure/instrument type. The following combinations are possible:

Component Name

Short Name























  • Specify further in the inlet description to distinguish between TGM and GEM when using monitors, i.e.: Heated inlet(50degC), Teflon filter and soda lime trap (GEM measured)or no trap (TGM measured)

  • Include information on routine checks and leak tests in the "Maintenance description" element

  • Include information on which standard pressure and temperature are used for conversion

  • Monitor data should be reported with one hour average, but several monitors sample with higher time resolution, i.e. five minutes. If so, report the standard deviation within each hour as a separate time series. Use the completeness flag (390-394) if low data coverage within the hour.

  • Include information if the instrument or lab have been part of any relevant laboratory intercomparison (ILC) or external audit, in the QA measures. Contact if the ILC is not defined.

  • Include information on which SOP is used.

  • The template is describing measurements with monitor. For manual methods, relevant metadata for analytical method needs to be added

  • Boundary and Spike Checks: Submitted data will be checked for boundaries, the current specification for boundary checks can be found here.
Downloading template as nasaames file

Please download the .nas file and edit, and remember to keep the .nas file-extension when you create your datafile:

Validation and submission:

To validate the file, please use the EBAS Submission Tool

Flags commonly used with this format:

The three main types of flags in EBAS are:

  • V (valid measurement): indicate a special condition at the station, but instrument has operated correctly, the data are therefore considered valid.
  • I (invalid measurement): showing that data are not available (not measured, deleted or if it is no precipitation)
  • M (missing measurement): mainly used for level 0 data to be able to exclude these data when being reprocessed to level 1 and level 2

For data harmonization across the network, the following short list of the flags should be used with this template. It is possible to use several flags at the same time to give detailed information about the data.

Group 0: Valid data
Flag Validity Description
000 V valid data, no flag
Group 1: Exception flags for accepted, irregular data
Flag Validity Description
147 V Below theoretical detection limit or formal Q/A limit, but a value has been measured and reported and is considered valid
Group 3: Flags for aggregated datasets
Flag Validity Description
390 V Data completeness less than 50%
392 V Data completeness less than 75%
394 V Data completeness less than 90%
Group 5: Chemical problem
Flag Validity Description
559 V Unspecified contamination or local influence, but considered valid
599 I Unspecified contamination or local influence
Group 9: Missing flags
Flag Validity Description
999 M Missing measurement, unspecified reason
64 1001
Aspmo, Katrine
NO01L, Norwegian Institute for Air Research, NILU, , Instituttveien 18, , 2007, Kjeller, Norway
Aspmo, Katrine
1 1
2019 01 01 2020 03 18
days from file reference point
1 1 1
99.999999 99.999 9.999
end_time of measurement, days from the file reference point
gaseous_elemental_mercury, ng/m3
numflag gaseous_elemental_mercury, no unit
Data definition: EBAS_1.1
Set type code: TU
Timezone: UTC
File name: NO0042G.20190101000000.20200318000000.Hg_mon.gaseous_elemental_mercury.air.1mo.1h.NO01L_tekran_42.NO01L_afs..nas
Startdate: 20190101000000
Revision date: 20200318000000
Statistics: arithmetic mean
Data level:
Period code: 1mo
Resolution code: 1h
Station code: NO0042G
Platform code: NO0042S
Station name: Zeppelin mountain (Ny-Ă…lesund)
Station GAW-ID: ZEP
Station GAW-Name: Zeppelin Mountain (Ny Ă…lesund)
Station land use: Gravel and stone
Station setting: Polar
Station GAW type: G
Station WMO region: 6
Station latitude: 78.90715
Station longitude: 11.88668
Station altitude: 474.0 m
Regime: IMG
Component: gaseous_elemental_mercury
Unit: ng/m3
Matrix: air
Laboratory code: NO01L
Instrument type: Hg_mon
Instrument name: tekran_42
Method ref: NO01L_afs
Inlet description: Heated inlet(50degC), Teflon filter and soda lime trap (GEM measured)
Inlet tube material: Teflon
Inlet tube length: 4.0 m
Maintenance description: daily check, soda lime changed biweekly, quaternary leak test and sample inlet change, perm souce check yearly
Flow rate: 1.5 l/min
Zero/span check type: automatic
Zero/span check interval: 25h
Humidity/temperature control: None
Volume std. temperature: 273.15 K
Volume std. pressure: 1013.25 hPa
Detection limit: 0.1 ng/m3
Detection limit expl.: Determined by instrument counting statistics,no detection limit flag used
Originator: Aspmo, Katrine, , Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway
Submitter: Aspmo, Katrine, , Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway
starttime endtime gaseous_elemental_mercury flag_gaseous_elemental_mercury
0.000000 0.041667 0.988 0.000
0.041667 0.083333 1.024 0.000

This service has been funded or supported by the Norwegian Institute for Air Research (NILU), the EU research infrastructure ACTRIS (Aerosols, Clouds, and Trace gases Research InfraStructure), the European Monitoring and Evaluation Programme (EMEP).