ambient air quality and cleaner air for Europe(2008-50-EC)(14)

ambient air quality and cleaner air for Europe(2008-50-EC)欧盟空气质量标准法案(2008-50-EC)

11.6.2008ENOfficialJournaloftheEuropeanUnionL152/19

2.Protectionofvegetationandnaturalecosystems

Samplingpointstargetedattheprotectionofvegetationandnaturalecosystemsshallbesitedmorethan20kmawayfromagglomerationsormorethan5kmawayfromotherbuilt-upareas,industrialinstallationsormotorwaysormajorroadswithtrafficcountsofmorethan50000vehiclesperday,whichmeansthatasamplingpointmustbesitedinsuchawaythattheairsampledisrepresentativeofairqualityinasurroundingareaofatleast1000km2.AMemberStatemayprovideforasamplingpointtobesitedatalesserdistanceortoberepresentativeofairqualityinalessextendedarea,takingaccountofgeographicalconditionsoroftheopportunitiestoprotectparticularlyvulnerableareas.Accountshallbetakenoftheneedtoassessairqualityonislands.

C.Microscalesitingofsamplingpoints

Insofarasispracticable,thefollowingshallapply:—

theflowaroundtheinletsamplingprobeshallbeunrestricted(freeinanarcofatleast270°)withoutanyobstruc-tionsaffectingtheairflowinthevicinityofthesampler(normallysomemetresawayfrombuildings,balconies,treesandotherobstaclesandatleast0,5mfromthenearestbuildinginthecaseofsamplingpointsrepresentingairqualityatthebuildingline),

ingeneral,theinletsamplingpointshallbebetween1,5m(thebreathingzone)and4mabovetheground.Higherpositions(upto8m)maybenecessaryinsomecircumstances.Highersitingmayalsobeappropriateifthestationisrepresentativeofalargearea,

theinletprobeshallnotbepositionedintheimmediatevicinityofsourcesinordertoavoidthedirectintakeofemissionsunmixedwithambientair,

thesampler’sexhaustoutletshallbepositionedsothatrecirculationofexhaustairtothesamplerinletisavoided,forallpollutants,traffic-orientatedsamplingprobesshallbeatleast25mfromtheedgeofmajorjunctionsandnomorethan10mfromthekerbside.,

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Thefollowingfactorsmayalsobetakenintoaccount:————————

interferingsources,security,access,

availabilityofelectricalpowerandtelephonecommunications,visibilityofthesiteinrelationtoitssurroundings,safetyofthepublicandoperators,

thedesirabilityofco-locatingsamplingpointsfordifferentpollutants,planningrequirements.,

D.Documentationandreviewofsiteselection

Thesite-selectionproceduresshallbefullydocumentedattheclassificationstagebysuchmeansascompass-pointpho-tographsofthesurroundingareaandadetailedmap.Sitesshallbereviewedatregularintervalswithrepeateddocu-mentationtoensurethatselectioncriteriaremainvalidovertime.

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