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PROCESSING EMEP DETAILS              

DENE BOWDALO, Updated 13th May 2018

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PROCESSING NOTES


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NETWORK DESCRIPTION


DESCRIPTION URL: 
     
DATA ACCESS URL: 

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QUALITY ASSESSMENT LEVEL (Sources: )



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CONTACT



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AVAIALABLE SPECIES (DATA LAST ACCESSED: 26TH APRIL)

Ozone ()
Nitric Oxide ()
Nitrogen Dioxide ()
Carbon Monoxide ()

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FORMAT


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METADATA/DETAIL FILES

CORE

OTHER


INSTRUMENT MANUALS

O3


NOx 


CO



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DATAFILE VARIABLES

Ozone:



Nitric Oxide and Carbon Monoxide: 



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METADATA VARIABLES



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UNITS (Sources: )

Ozone              
Nitric Oxide      
Nitric Dioxide   
Carbon Monoxide   

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UNIT PRECISION (Sources:)

Ozone             

                                   
Nitric Oxide      


Nitrogen Dioxide  


Carbon Monoxide   


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LIMIT OF DETECTION (Sources: )

**Defined as twice the zero noise level by the US EPA - and is typically reported as such

Ozone             

                                   
Nitric Oxide      


Nitrogen Dioxide  


Carbon Monoxide  


Isoprene 


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REPRESENTIVITY (Source: )

Given inconsistently 

SITE TYPES:
None Given

LOCAL LAND USE CLASSIFICATION (Dominant radius distance: None Given) 
Agricultural
Airport
Blighted area
Commercial
Desert
Forest
Grassland
Gravel and stone
Industrial
Military reservation
Remote park
Residential
Single point source area
Snowfield
Urban park
Wetland
Not available
Other

LEVELS OF URBANISATION (originally given as Station setting)
Mountain
Polar
Coastal
Rural
Suburban
Urban and center city
Other
Not available


NEIGHBOURHOOD POPULATION 

None Given

SCALE OF REPRESENTATIVENESS


TERRAIN


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MEASUREMENT METHODLOGIES (Sources: )

Ozone - 

Nitric Oxide - 

Nitrogen Dioxide - 

Carbon Monoxide - 

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INSTRUMENT NAME/MODEL NUMBERS (Sources: )

Ozone:

        
Nitric Oxide:    


Nitrogen Dioxide:
              
Carbon Monoxide:   


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NETWORK DATA FLAGS (WITH PERSONAL ACCEPTANCE CODES)        *A*=ACCEPTED   *N*=NOT ACCEPTED
(Sources: )

V = Deemed valid by EMEP
M = Missing value
I = Deemed Invalid by EMEP

Missing flags:
999	M	Missing measurement, unspecified reason
990	M	Precipitation not measured due to snow-fall. Needed for historic data, should not 
        be needed for new data
980	M	Missing due to calibration or zero/span check
900	H	Hidden and invalidated by data originator

Flags for undefined data elements:
899	M	Measurement undefined, unspecified reason
890	M	Concentration in precipitation undefined, no precipitation

Flags used when the value is unknown
799	I	Measurement missing (unspecified reason), data element contains estimated value
798	V	Measurement missing (unspecified reason), data element contains estimated value. 
        Considered valid.
797	V	Data element taken from co-located instrument
784	I	Low precipitation, concentration estimated
783	M	Low precipitation, concentration unknown
782	V	Low precipitation, concentration estimated
781	V	Value below detection limit, data element contains detection limit
780	V	Value below detection or quantification limit, data element contains estimated or 
        measured value. Use of flag 147 is encouraged.
771	V	Value above range, data element contains upper range limit
770	V	Value above range, data element contains estimated value
760	V	Value estimated by summing up the constituents measured
750	M	H+ not measured in alkaline sample
741	V	Non refractory AMS concentrations. Don't include compounds that volatalises above 
        600 deg C
740	V	Probably biased gas/particle ratio
701	I	Less accurate than usual, unspecified reason. (Used only with old data, for new 
        data see groups 6 and 5)

Mechanical or instrumental problem:
699	I	Mechanical problem, unspecified reason *N*
685	I	Invalid due to secondary standard gas measurement. Used for Level 0. *N*
684	I	Invalid due to zero/span check. Used for Level 0. *N*
683	I	Invalid due to calibration. Used for Level 0. *N*
682	I	Invalid due to calibration or zero/span check. Used for Level 0. *N*
681	I	Low data capture *N*
680	V	Undefined wind direction
679	V	Unspecified meteorological condition
678	V	Hurricane
677	I	Icing or hoar frost in the intake *N*
676	V	station inside cloud (visibility < 1000 m)
675	V	no visibility data available
674	V	Icing or hoar frost in the intake, considered valid
670	I	Incomplete data acquisition for multi-component data sets
669	I	Moist or wet filter, invalid *N*
668	V	Moist or wet filter, valid
666	I	Filter damaged, invalid *N*
665	V	Filter damaged, valid
664	I	Instrument flow(s) too far off target value, considered invalid
663	I	Too high sampling flow, data considered invalid *N*
662	V	Too high sampling flow, data considered valid
660	V	Unspecified sampling anomaly, considered valid
659	I	Unspecified sampling anomaly *N*
658	I	Too small air volume *N*
657	V	Precipitation collector overflow. Heavy snowfall/rain shower (squall)
656	V	Wet-only collector failure, operated as bulk collector
655	V	Estimated value created by averaging or splitting samples
654	V	Sampling period longer than normal, considered representative. Observed values 
        reported
653	V	Sampling period shorter than normal, considered representative. Observed values 
        reported
652	V	Construction/acitivity nearby
651	V	Agricultural activity nearby
650	V	Precipitation collector failure
649	V	Temporary power fail has affected sampler operation
648	V	Snow sampler
647	V	Fire/wood burning nearby
646	I	Exceptional traffic nearby *N*
645	V	Exceptional traffic nearby
644	V	Low instrument precision and/or calibration issues
641	I	Aerosol filters installed incorrectly *N*
640	V	Instrument internal relative humidity above 40%
635	I	Internal temperatures too far off target value, considered invalid
632	V	Lid of polyurethane foam (PUF) sampler not closed
630	V	POP concentration from the polyurethane foam (PUF) only

Chemical problem:
599	I	Unspecified contamination or local influence 
593	I	Industrial contamination, considered invalid
591	I	Agricultural contamination, considered invalid
578	I	Large sea salt contribution (ratio between marine and excess sulphate is larger 
        than 2.0). Used for old data only. For newer data use 451/450.
568	I	Dust contamination, considered invalid
567	I	Insect contamination, considered invalid
566	I	Bird droppings, considered invalid
565	I	Pollen and/or leaf contamination, considered invalid
559	V	Unspecified contamination or local influence, but considered valid
558	V	Dust contamination, but considered valid
557	V	Insect contamination, but considered valid
556	V	Bird droppings, but considered valid
555	V	Pollen and/or leaf contamination, but considered valid
549	I	Impure chemicals
541	I	Gold trap passiviated by unknown compound
540	I	Spectral interference in laboratory analysis
534	I	Wrong coated denuder used
533	I	Filters mixed up; incorrect analysis
532	V	Data less accurate than normal due to high field blank value
531	V	Low recovery, analysis inaccurate
530	I	Invalid due to too low or too high recovery
521	V	Bactericide was added to sample for storage under warm climate. Considered valid

Extreme or inconsistent values:
499	V	Inconsistent with another unspecified measurement
498	V	Gold trap inconsistency in mercury monitor
478	I	Invalid due to inconsistency discovered through ion balance calculations
477	I	Invalid due to inconsistency between measured and estimated conductivity
476	V	Inconsistency discovered through ion balance calculations, but considered valid
475	V	Inconsistency between measured and estimated conductivity, but considered valid
471	I	Particulate mass concentration higher than parallell mass concentration 
        measurement with higher cut off i.e PM1_mass > PM25_mass and PM25_mass > 
        PM10_mass. Considered invalid.
470	V	Particulate mass concentration higher than parallell mass concentration 
        measurement with higher cut off i.e PM1_mass > PM25_mass and PM25_mass > 
        PM10_mass
460	I	Contamination suspected
459	I	Extreme value, unspecified error
458	V	Extremely high value, outside four times standard deviation in a lognormal 
        distribution
457	V	Extremely low value, outside four times standard deviation in a lognormal 
        distribution
456	I	Invalidated by data originator
452	I	Invalid due to large uncertainty
451	I	Invalid due to large sea salt contribution
450	V	Considerable sea salt contribution, but considered valid
440	V	Reconstructed or recalculated data
420	V	Preliminary data
410	V	Sahara dust event

Flags for aggregated datasets
395	I	Data completeness less than 90%
394	V	Data completeness less than 90%
393	I	Data completeness less than 75%
392	V	Data completeness less than 75%
391	I	Data completeness less than 50%
390	V	Data completeness less than 50%
389	I	Data completeness less than 66%
388	V	Data completeness less than 66%
382	V	More than 75% of the measurements are below detection limit
380	V	More than 50% of the measurements are below detection limit
370	V	For monthly averages with samples partly in two months, the number of days in each 
        month is used for weighing the sample

Exception flags assigned by the database co-ordinator
299	V	Inconsistent with another unspecified measurement
298	V	Gold trap inconsistency in mercury monitor
278	I	Invalid due to inconsistency discovered through ion balance calculations
277	I	Invalid due to inconsistency between measured and estimated conductivity
276	V	Inconsistency discovered through ion balance calculations, but considered valid
275	V	Inconsistency between measured and estimated conductivity, but considered valid
260	I	Contamination suspected
259	I	Unspecified error expected
258	V	Extremely high value, outside four times standard deviation in a log-normal 
        distribution
257	V	Extremely low value, outside four times standard deviation in a log-normal 
        distribution
256	I	Invalidated by database co-ordinator *N*
251	I	Invalid due to large sea salt contribution
250	V	Considerable sea salt contribution, but considered valid
249	V	Apparent typing error corrected. Valid measurement
248	V	Illegal flag was removed by the database co-ordinator. Lost flag information (used 
        for historic data only).
247	V	Overlapping sample interval was corrected by the database co-ordinator. Possible 
        wrong sample time (used for historic data only)
220	V	Preliminary data
211	V	Irregular data checked and accepted by database co-ordinator. Valid measurement
210	V	Episode data checked and accepted by database co-ordinator. Valid measurement

Exception flags for accepted, irregular data
191	V	Data not truncation corrected - Valid measurement
190	V	Not corrected for cross-sensitivity to particle scattering
189	V	Possible local contamination indicated by wind from contaminated sector (auto)
188	V	Possible local contamination indicated by low wind speed (auto)
187	V	Possible local contamination indicated by occurence of new particles (auto)
186	V	Possible local contamination indicated by single scattering albedo (auto)
185	V	Possible local contamination indicated by wind direction or velocity
147	V	Below theoretical detection limit or formal Q/A limit, but a value has been 
        measured and reported and is considered valid
120	V	Sample reanalysed with similar results. Valid measurement
111	V	Irregular data checked and accepted by data originator. Valid measurement
110	V	Episode data checked and accepted by data originator. Valid measurement
103	V	CV of replicate ALPHA samplers > 15 %;. Valid measurement
102	V	CV of replicate diffusion tubes > 30 %. Valid measurement
101	V	Denuder capture efficiency < 75%. Valid measurement
100	V	Checked by data originator. Valid measurement, overrides any invalid flags

Valid data
000	V	Valid measurement

MISSING DATA FILL = Variable per species, given in file headers

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EXTRA DETAILS
