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1、IntroductionHazeisacombinationoffogandhaze.Becauseofthedeteriorationofairquality,hazeweatherphenomenonincreased,aggravatingthedamage.Inchina,manyareasthehazeweatherphenomenonintothemistasearlywarningandforecastingdisastrousweather.Collectivelyreferredtoas
2、the"hazeweather".Infact,fogandhazeisverydifferentfromacertainpointofview.Forexample:thepresenceoffoghazeappearedmoistair;airisrelativelydry,airrelativehumidityisbelow60%.Thecauseofitsformationisduetoalargenumberofverysmallparticlesofdust,soot,saltandevenl
3、yfloatingintheair,sothattheeffectivehorizontalvisibilitytolessthan10KMairmixederosionphenomenon.Diurnalvariationofhazeisgenerallynotobvious.Whenthereisnobigchange,airmassisstable,sustainedoveralongperiodoftime,sometimes10daysmoresustainable.Becauseoftheha
4、ze,fog,sandduststorm,blowingsand,dust,smokeandotherweatherphenomena,isfloatingintheairalotofveryfineparticlesofdustorsmokeparticlescausedtheeffectivehorizontalvisibilitytolessthan10KM.Sometimesthemeteorologicalprofessionalsaredifficulttodistinguish.Mustbe
5、combinedwiththeweatherbackground,skyconditions,airhumidity,color,odorandsatellitemonitoringofsuchfactorsasthecomprehensiveanalysisandjudgment,todrawtherightconclusions,buttheweatherphenomenonoffogandhazearesometimesinterchangeable.Hazeharmfultohumanbodyaf
6、terinhalationofthehumanrespiratorytract,long-terminhalationofseverecasescanleadtodeath.BackgroundlThehazeweatherappearinBeijingagainThe28day,aftertheNationalDayholidayinBeijingafterthemostobvioushazeweather,airqualityreachedagainmoreseriouspollutionlevel.
7、BeijingMunicipalEnvironmentalProtectionBureaustaffsaid,Beijinghavebeenthefirsttostartheavyairpollutionemergencyplanbluewarning.Intheafternoonon27th,Beijingseethehazeagain,Beijingmeteorologicalobservatorywhenreleasehazeyellowwarningsignal.On28th,pollutiond
8、egreegraduallyincrease,airqualityandvisibilityispoor.Withthecontinuedcalmweather,thepollutiondegreeandtheregioncontinuedtoincreaseandspread.Ontheafternoonofthesameday,theskyisgrey,moreairqualityreachedtheseriouspoll
