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Data Submission Manual
Submit DataData ReportingTemplatesCategoryTrace GasesNOxlevel0    October 1, 2020

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 submission of NOx measurements by online monitors 
This template should be used for submitting data of NOx as measured by online field monitors.

Points to note:

  • NOx measurements by chemiluminescence photometry uses either a photolytic or molybdenum converter for transforming NO2 into NO. It is well established that molybdenum converters convert not only NO2, but also other reactive nitrogen species. Please note that at rural and remote sites, only the use of photolytic converters satisfy the recommendations of EMEP, ACTRIS and GAW. Thus, when submitting data it is essential to specify the type of instrument and converter being used. This is specified in the metadata element “Instrument type”.
  • Please note that you should also report surface ozone and met data (RH, T, P, global radiation) in their respective templates if a correction of O3 reaction in the inlet line and H2O quenching in the detector is to be done.
  • A complete list of EBAS metadata elements and their relevance


Downloading template as text file

You could download the template and start to modify the text with your own metadata. Due to limitations of the online portal we could not provide files with the .nas file extension. So please download the text file and edit, and remember to use the .nas file-extension when you create your datafile: 

* To validate the file, please use the EBAS Submission Tool

Flags commonly used with this format:

A full list of flags could be found here.

Group 9: Missing flags

Flag Validity Description
999 M Missing measurement, unspecified reason

Group 6: Mechanical or instrumental problem

Flag Validity Description
682 I Invalid due to calibration or zero/span check

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 3: Flags for aggregated datasets

Flag Validity Description
390 V Data completeness less than 50%

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 0: Valid data

Flag Validity Description
000 V Valid measurement

Template for Data Submission:

97 1001
Fiebig, Markus; Someone, Else
NO01L, Norwegian Institute for Air Research, NILU, , Instituttveien 18, , N-2027, Kjeller, Norway
Fiebig, Markus
1 1
2014 01 01 2014 06 24
days from file reference point
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
99.99999999 99.999 99.9999 99.9999 99.999 9.999999999 99.999 99.9999 99.9999 99.999 9.999999999 9999 99999 99.999 999.999 9999.999 9999.999 9.999999999
end_time of measurement, days from the file reference point
nitrogen_monoxide, nmol/mol
nitrogen_monoxide, nmol/mol, Statistics=expanded uncertainty 2sigma
nitrogen_monoxide, nmol/mol, Statistics=precision
nitrogen_monoxide, nmol/mol, Statistics=detection limit
numflag, no unit
nitrogen_dioxide, nmol/mol
nitrogen_dioxide, nmol/mol, Statistics=expanded uncertainty 2sigma
nitrogen_dioxide, nmol/mol, Statistics=precision
nitrogen_dioxide, nmol/mol, Statistics=detection limit
numflag, no unit
NO_#counts, cps
NO_converter_#counts, cps
NO_sensitivity, (pmol/mol)/cps
converter_efficiency, %
temperature, K, Location=inlet, Matrix=instrument
pressure, hpa, Location=inlet, Matrix=instrument
numflag, no unit
Data definition:                         EBAS_1.1
Set type code:                           TU
Station code:                            NO0001R
Platform code:                           NO0001S
Timezone:                                UTC
Startdate:                               20140101000000
Revision date:                           20140624000000
Component:                               NOx
Unit:                                    nmol/mol
Matrix:                                  air
Period code:                             1y
Resolution code:                         1mn 
Sample duration:                         1mn 
Laboratory code:                         NO01L
Instrument type:                         chemiluminescence_photolytic
Instrument manufacturer:                 Ecophysics
Instrument model:                        CLD899+PLC860
Instrument serial number:                70810508+70810510
Instrument name:                         Ecophysics_CLD899_Ecophysics_PLC860_BIR
Method ref:                              NO01L_chem_photoly_Ecophysics_CLD899Y_PLC860
Orig. time res.:                         1mn
File name:                               NO0001R.20140101000000.20140624000000.NOx.air.1y.1h.nas
Station WDCA-ID:                         GAWANO__BIR
Station GAW-Name:                        Birkenes Atmospheric Observatory
Station GAW-ID:                          BIR
Station AIRS-ID:                         
Station other IDs:                       201(NILUDB)
Station state/province:                  
Station latitude:                        58.380
Station longitude:                       8.250
Station altitude:                        220m
Station land use:                        Forest
Station setting:                         Rural
Station GAW type:                        R
Station WMO region:                      6
Originator:                              Fiebig, Markus,, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18,, N-2027, Kjeller, Norway
Originator:                              Someone, Else,, Some nice Institute, WOW, Super interesting division, Street 18,, X-9999, Paradise, Noway
Submitter:                               Fiebig, Markus,, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18,, N-2027, Kjeller, Norway
Data level:                              0 
Version:                                 1
Version description:                     initial revision, manually inspected
Measurement height:                      4m
Inlet type:                              Hat or hood
Inlet tube material:                     Teflon 
Inlet description:                       Dark. Downward facing inlet with hood
Time from entry inlet line to entry of converter:4.3s 
Duration of stay in converter or bypass line:0.2s     
Duration of stay in converter:           2.5s 
Converter temperature:                   308.15K  
Humidity/temperature control:            None
Humidity/temperature control description:Passive, inlet air heated from atmospheric to converter temperature
Detection limit expl.:                   Determined by instrument counting statistics
Measurement uncertainty expl.:           Includes statistical uncertainty of individual sample and calibration uncertainty
QA1 measure ID:                          ACTRIS NOx s-b-s 2012
QA1 date:                                20121116000000 
QA1 document URL:                        ""  
QA2 measure ID:                        ACTRIS NO round robin 2012
QA2 date:                                20120206000000
QA2 document URL:                  "" 
Zero/negative values code:               Zero/negative possible
Zero/negative values:                    Zero and neg. values may appear due to statistical variations at very low concentrations
Standard method:                         SOP=ACTRIS_NOxy_2014
Acknowledgement:                         Request acknowledgement details from data originator
start_time end_time NO NO_ac NO_pr NO_dl numflag_NO NO2 NO2_ac NO2_pr NO2_dl numflag_NO2 NO_count NOc_count NO_sens converter_eff T_inlet p_inlet  numflag_int
0.00000000 0.00069444 0.331 0.0800 0.0070 0.005 0.000000000 10.080 0.0700 0.0060 0.010 0.000000000 258 5200 1.283 45.351 299.700  839.400 0.000000000
0.00069444 0.00138888 0.596 0.0800 0.0070 0.005 0.000000000 9.765  0.0700 0.0600 0.010 0.000000000 510 4780 1.169 49.265 299.750  839.400 0.000000000
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