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1、Similaritiesbetweenfogandhazearevisibilityobstruction.Butthereasonsfortheformationoffogandhazeandconditionsbutthere'sabigdifference.Fogisfloatingintheairofalargenumberofsmallwaterdropletsoricecrystals,formingconditionsrequiresahigherwatervaporsaturated.Appearedfogairhumidity,air
2、relativehumidityis100%,orcloserto100%.Appearwhenthefogeffectivehorizontalvisibilitytolessthan1km.Wheneffective1-10kmhorizontalvisibilityasmist.Foghaswiththedailyvariationofairhumidityandappearsoonerorlater,themorecommonoraddthick,relativelyreduceanddisappearphenomenonduringtheda
3、y.Ahazewhenairisrelativelydry,airrelativehumidityunder80%usually.Itsformationisduetoalargenumberoftinyparticlesofdust,smoke,saltcrystalsevenlysuspendedintheair,makeeffectivehorizontalvisibilitytolessthan10kmairmixedcorrosionphenomenon,symbolsfor"up".Thediurnalvariationofthehazei
4、snotobviousingeneral.Whenairmasseswithoutbigchanges,theairmassisstable,continuetoappearforalongtime,sometimessustainablemorethan10days.Becausethehazeandmist,dust,flyingsand,dust,smoke,suchasaweatherphenomenon,floatingintheairforallthelargenumberofverysmalldustparticlesandsmoketh
5、ateffectivehorizontalvisibilitytolessthan10km.Sometimesmakesmeteorologicalprofessionalsaredifficulttodistinguish.Mustbecombinedwiththeweatherbackground,aircondition,airhumidity,color,smellandotherfactors,suchassatellitemonitoringtocomprehensiveanalysisandjudgment,tocorrectconclu
6、sions,andfogandhazeweatherphenomenoncantransformeachothersometimes.雾和霾相同之处都是视程障碍物。但雾与霾的形成原因和条件却有很大的差别。雾是浮游在空中的大量微小水滴或冰晶，形成条件要具备较高的水汽饱和因素。出现雾时空气潮湿，空气相对湿度常达100%或接近100%。出现雾时有效水平能见度小于1KM。当有效水平能见度1－10KM时称为轻雾。雾有随着空气湿度的日变化而出现早晚较常见或加浓，白天相对减轻甚至消失的现象。出现霾时空气则相对干燥，空气相对湿度通常在80%以下。其形成原因是由于大量极
7、细微的尘粒、烟粒、盐粒等均匀地浮游在空中，使有效水平能见度小于10KM的空气混蚀的现象，符号为“∞”。霾的日变化一般不明显。当气团没有大的变化，空气团较稳定时，持续出现时间较长，有时可持续10天以上。由于阴霾、轻雾、沙尘暴、扬沙、浮尘、烟雾等天气现象，都是因浮游在空中大量极微细的尘粒或烟粒等影响致使有效水平能见度小于10KM。有时使气象专业人员都难于区分。必须结合天气背景、天空状况、空气湿度、颜色气味及卫星监测等因素来综合分析判断，才能得出正确结论，而且雾和霾的天气现象有时可以相互转换的。MeasurestopreventGooutwearingama
8、skIfgooutcanbeputonthemask,sothatwecaneffective
