(3)Oneday’smeasurementaweekatrandom,evenlydistributedovertheyear,oreightweeksevenlydistributedovertheyear.(4)Onemeasurementaweekatrandom,evenlydistributedovertheyear,oreightweeksevenlydistributedovertheyear.
Theuncertainty(expressedata95%confidencelevel)oftheassessmentmethodswillbeevaluatedinaccordancewiththeprinciplesoftheCENGuidetotheExpressionofUncertaintyinMeasurement(ENV13005-1999),themethodol-ogyofISO5725:1994andtheguidanceprovidedintheCENreport‘AirQuality—ApproachtoUncertaintyEstima-tionforAmbientAirReferenceMeasurementMethods’(CR14377:2002E).Thepercentagesforuncertaintyintheabovetablearegivenforindividualmeasurementsaveragedovertheperiodconsideredbythelimitvalue(ortargetvalueinthecaseofozone),fora95%confidenceinterval.Theuncertaintyforthefixedmeasurementsshallbeinterpretedasbeingapplicableintheregionoftheappropriatelimitvalue(ortargetvalueinthecaseofozone).
Theuncertaintyformodellingisdefinedasthemaximumdeviationofthemeasuredandcalculatedconcentrationlevelsfor90%ofindividualmonitoringpoints,overtheperiodconsidered,bythelimitvalue(ortargetvalueinthecaseofozone),withouttakingintoaccountthetimingoftheevents.Theuncertaintyformodellingshallbeinterpretedasbeingapplicableintheregionoftheappropriatelimitvalue(ortargetvalueinthecaseofozone).Thefixedmeasurementsthathavetobeselectedforcomparisonwithmodellingresultsshallberepresentativeofthescalecoveredbythemodel.
ambient air quality and cleaner air for Europe(2008-50-EC)欧盟空气质量标准法案(2008-50-EC)
11.6.2008ENOfficialJournaloftheEuropeanUnionL152/15
Theuncertaintyforobjectiveestimationisdefinedasthemaximumdeviationofthemeasuredandcalculatedconcen-trationlevels,overtheperiodconsidered,bythelimitvalue(ortargetvalueinthecaseofozone),withouttakingintoaccountthetimingoftheevents.
Therequirementsforminimumdatacaptureandtimecoveragedonotincludelossesofdataduetotheregularcali-brationorthenormalmaintenanceoftheinstrumentation.B.Resultsofairqualityassessment
Thefollowinginformationshallbecompiledforzonesoragglomerationswithinwhichsourcesotherthanmeasure-mentareemployedtosupplementinformationfrommeasurementorasthesolemeansofairqualityassessment:————
adescriptionofassessmentactivitiescarriedout,
thespecificmethodsused,withreferencestodescriptionsofthemethod,thesourcesofdataandinformation,
adescriptionofresults,includinguncertaintiesand,inparticular,theextentofanyareaor,ifrelevant,thelengthofroadwithinthezoneoragglomerationoverwhichconcentrationsexceedanylimitvalue,targetvalueorlong-termobjectiveplusmarginoftolerance,ifapplicable,andofanyareawithinwhichconcentrationsexceedtheupperassessmentthresholdorthelowerassessmentthreshold,
thepopulationpotentiallyexposedtolevelsinexcessofanylimitvalueforprotectionofhumanhealth.
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C.Qualityassuranceforambientairqualityassessment:datavalidation
1.ToensureaccuracyofmeasurementsandcompliancewiththedataqualityobjectiveslaiddowninSectionA,theappropriatecompetentauthoritiesandbodiesdesignatedpursuanttoArticle3shallensurethefollowing:—
thatallmeasurementsundertakeninrelationtotheassessmentofambientairqualitypursuanttoArticles6and9aretraceableinaccordancewiththerequirementssetoutinSection5.6.2.2oftheISO/IEC17025:2005,thatinstitutionsoperatingnetworksandindividualstationshaveanestablishedqualityassuranceandqualitycontrolsystemwhichprovidesforregularmaintenancetoassuretheaccuracyofmeasuringdevices,thataqualityassurance/qualitycontrolprocessisestablishedfortheprocessofdatacollectionandreportingandthatinstitutionsappointedforthistaskactivelyparticipateintherelatedCommunity-widequalityassur-anceprogrammes,
thatthenationallaboratories,whenappointedbytheappropriatecompetentauthorityorbodydesignatedpur-suanttoArticle3,thataretakingpartinCommunity-wideintercomparisonscoveringpollutantsregulatedinthisDirective,areaccreditedaccordingtoEN/ISO17025by2010forthereferencemethodsreferredtoinAnnexVI.TheselaboratoriesshallbeinvolvedinthecoordinationonMemberStatesterritoryoftheCommu-nitywidequalityassuranceprogrammestobeorganisedbytheCommissionandshallalsocoordinate,onthenationallevel,theappropriaterealisationofreferencemethodsandthedemonstrationofequivalenceofnon-referencemethods.
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2.AllreporteddataunderArticle27shallbedeemedtobevalidexceptdataflaggedasprovisional.
ambient air quality and cleaner air for Europe(2008-50-EC)欧盟空气质量标准法案(2008-50-EC)
L152/16ENOfficialJournaloftheEuropeanUnion11.6.2008
ANNEXII
Determinationofrequirementsforassessmentofconcentrationsofsulphurdioxide,nitrogendioxideandoxidesofnitrogen,particulatematter(PM10andPM2,5),lead,benzeneandcarbonmonoxideinambientair
withinazoneoragglomeration
A.Upperandlowerassessmentthresholds
Thefollowingupperandlowerassessmentthresholdswillapply:
1.Sulphurdioxide
Healthprotection
Vegetationprotection
Upperassessmentthreshold
60%of24-hourlimitvalue(75µg/m3,nottobeexceededmorethan3timesinanycalendaryear)
40%of24-hourlimitvalue(50µg/m3,nottobeexceededmorethanthreetimesinanycalendaryear)