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.