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Data Submission Manual
Submit DataData ReportingTemplatesCategoryTrace GasesNOxlevel2    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”.
  • When calculating average values, e.g. hourly, from measurements with higher time
    resolution, please disregard any invalid measurements. Any informative flags,
    e.g. local contamination, occuring at any time during the average period need to
    be copied to the average value.
  • 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:

100 1001
Fiebig, Markus; Someone, Else
NO01L, Norwegian Institute for Air Research, NILU, , Instituttveien 18, , N-2027, Kjeller, Norway
Fiebig, Markus
1 1
2012 01 01 2012 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 1 1 1 1 1 1 1 
9999.999999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 99.999 9.999999999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 99.999 9.999999999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 99.99 9.999999999
end_time of measurement, days from the file reference point
nitrogen_monoxide, nmol/mol, Statistics=arithmetic mean, Calibration scale=NPL
nitrogen_monoxide, nmol/mol, Statistics=stddev
nitrogen_monoxide, nmol/mol, Statistics=percentile:15.87
nitrogen_monoxide, nmol/mol, Statistics=percentile:84.13
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, Statistics=arithmetic mean, Calibration scale=NPL+GPT
nitrogen_dioxide, nmol/mol, Statistics=stddev
nitrogen_dioxide, nmol/mol, Statistics=percentile:15.87
nitrogen_dioxide, nmol/mol, Statistics=percentile:84.13
nitrogen_dioxide, nmol/mol, Statistics=expanded uncertainty 2sigma
nitrogen_dioxide, nmol/mol, Statistics=precision
nitrogen_dioxide, nmol/mol, Statistics=detection limit
numflag, no unit
NOx, nmol/mol, Statistics=arithmetic mean
NOx, nmol/mol, Statistics=stddev
NOx, nmol/mol, Statistics=percentile:15.87
NOx, nmol/mol, Statistics=percentile:84.13
NOx, nmol/mol, Statistics=expanded uncertainty 2sigma
NOx, nmol/mol, Statistics=precision
NOx, nmol/mol, Statistics=detection limit
numflag, no unit
Data definition:                         EBAS_1.1
Set type code:                           TU
Station code:                            NO0001R
Platform code:                           NO0001S
Timezone:                                UTC
Startdate:                               20120101000000
Revision date:                           20120624000000
Component:                               NOx
Unit:                                    nmol/mol
Matrix:                                  air
Period code:                             1y
Resolution code:                         1h
Sample duration:                         1h
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.20120101000000.20120624000000.chemiluminescence_photolytic.NOx.air.1y.1h.NO01L_Ecophysics_CLD899_Ecophysics_PLC860_BIR.NO01L_chem_photoly_Ecophysics_CLD899Y_PLC860.lev2.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:                              2
Version:                                 1
Version description:                     initial revision, manually inspected
Measurement height:                      4m
Inlet type:                              Hat or hood
Inlet description:                       Downward facing with hood
Humidity/temperature control:            None
Humidity/temperature control description:passive, sample heated from atmospheric to lab temperature
Detection limit expl.:                   Determined by instrument counting statistics
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:                  "" 
Water vapor correction:                  Not corrected for water vapor quenching in CLD
Ozone correction:                  Not corrected for reaction with O3 in the inlet                  
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 NOstddev NOperc16 NOperc84 NO_ac NO_pr NO_dl numflag_NO NO2 NO2stddev NO2perc16 NO2perc84 NO2_ac NO2_pr NO2_dl numflag_NO2 NOx NOxstddev NOxperc16 NOxperc84 NOx_ac NOx_pr NOx_dl numflag_NOx
0.000000 0.041667 0.9322 0.0186 0.9322 0.9322 0.0800 0.0070 0.005 0.000000000 0.2224 0.0044 0.2224 0.2224 0.0300 0.0040 0.010 0.000000000 1.1546 0.0054 1.0522 1.2244 0.0700 0.0060 0.10 0.000000000
0.041667 0.083333 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 99.999 9.999000000 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 99.999 9.999000000 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 9999.9999 99.99 9.999000000
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