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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.霧和霾相同之處都是視程障礙物。但霧與霾的形成原因和條件卻有很大的差別。霧是浮游在空中的大量微小水滴或冰晶，形成條件要具備較高的水汽飽和因素。出現(xiàn)霧時(shí)空氣潮濕，空氣相對(duì)濕度常達(dá)100%或接近100%。出現(xiàn)霧時(shí)有效水平能見度小于1KM。當(dāng)有效水平能見度1－10KM時(shí)稱為輕霧。霧有隨著空氣濕度的日變化而出現(xiàn)早晚較常見或加濃，白天相對(duì)減輕甚至消失的現(xiàn)象。出現(xiàn)霾時(shí)空氣則相對(duì)干燥，空氣相對(duì)濕度通常在80%以下。其形成原因是由于大量極
7、細(xì)微的塵粒、煙粒、鹽粒等均勻地浮游在空中，使有效水平能見度小于10KM的空氣混蝕的現(xiàn)象，符號(hào)為“∞”。霾的日變化一般不明顯。當(dāng)氣團(tuán)沒有大的變化，空氣團(tuán)較穩(wěn)定時(shí)，持續(xù)出現(xiàn)時(shí)間較長(zhǎng)，有時(shí)可持續(xù)10天以上。由于陰霾、輕霧、沙塵暴、揚(yáng)沙、浮塵、煙霧等天氣現(xiàn)象，都是因浮游在空中大量極微細(xì)的塵?；驘熈５扔绊懼率褂行侥芤姸刃∮?0KM。有時(shí)使氣象專業(yè)人員都難于區(qū)分。必須結(jié)合天氣背景、天空狀況、空氣濕度、顏色氣味及衛(wèi)星監(jiān)測(cè)等因素來綜合分析判斷，才能得出正確結(jié)論，而且霧和霾的天氣現(xiàn)象有時(shí)可以相互轉(zhuǎn)換的。MeasurestopreventGooutwearingama
8、skIfgooutcanbeputonthemask,sothatwecaneffective
