Designation:D1357−95(Reapproved2011)StandardPracticeforPlanningtheSamplingoftheAmbientAtmosphere1ThisstandardisissuedunderthefixeddesignationD1357;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thepurposeofthispracticeistopresentthebroadconceptsofsamplingtheambientairfortheconcentrationsofcontaminants.Detailedproceduresarenotdiscussed.Generalprinciplesinplanningasamplingprogramaregivenincludingguidelinesfortheselectionofsitesandthelocationoftheairsamplinginlet.1.2Investigationsofatmosphericcontaminantsinvolvethestudyofaheterogeneousmassunderuncontrolledconditions.Interpretationofthedataderivedfromtheairsamplingprogrammustoftenbebasedonthestatisticaltheoryofprobability.Extremecaremustbeobservedtoobtainmeasure-mentsoverasufficientlengthoftimetoobtainresultsthatmaybeconsideredrepresentative.1.3Thevariablesthatmayaffectthecontaminantconcen-trationsaretheatmosphericstability(temperature-heightprofile),turbulence,windspeedanddirection,solarradiation,precipitation,topography,emissionrates,chemicalreactionratesfortheirformationanddecomposition,andthephysicalandchemicalpropertiesofthecontaminant.Toobtainconcen-trationsofgaseouscontaminantsintermsofweightperunitvolume,theambienttemperatureandatmosphericpressureatthelocationsampledmustbeknown.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD3249PracticeforGeneralAmbientAirAnalyzerProce-duresD3614GuideforLaboratoriesEngagedinSamplingandAnalysisofAtmospheresandEmissionsNOTE1—Alistofreferencesareappendedtothispracticewhichp...
