给你两篇,一篇是专业的,另一篇是比较简单的

　　Thereareseveralmaincausesofairpollution,thevastmajorityofthemcanbeattributedtoman.Thisarticlewillgiveyouadefinitionofairpollutionandlistsomeofthetopcausesandhoweachonecontributestothecontaminationintheatmosphere.

　　Airpollutionistheintroductionintotheatmosphereofchemicals,particulates,andbiologicalmatterthatcauseharmtohumans,otherlivingorganisms,orcausedamagetothenaturalenvironment.Stratosphericozonedepletion(contributedtoairpollution)haslongbeenrecognizedasathreattohumanhealthaswellastotheEarth’secosystems.TheEarthiscapableofcleaningitselfofacertainlevelofpollution,butman-madepollutanthavebecometoonumerousfortheEarth’snaturalmechanismstoremove.Weareseeingtheresultsofthisoverloadintheformofacidrain,smog,andthevarietyofhealthproblemsthatcanbecontributedtoourenvironment.

　　Oneofthemaincausesofairpollutionismanufacturing.Thissourceofpollutionspewsparticulatematterandchemicalsintotheatmosphere.Theexhaustfromafactoryincludes,sulfuroxides,nitrogenoxides,carbonmonoxideanddioxide,aswellasvolatileorganiccompoundsandparticulates.ThereisnotanareaoftheEarth’satmosphereoranecosystemthathasnotbeenalteredbythelongtermeffectsofthepollutioncreatedbymanufacturing.Strideshavebeenmadetofilterthematerialcomingfrommanufacturingplants,butitmaytaketheEarthmilleniatocompletelyrecoverfromthedamagealreadydone.

　　Asthelistofcausesofairpollutiongoesthisnextoffenderisnumberone.Theburningoffossilfuelsisapartoftheeverydaylifeofeveryhumanontheplanet.Weburnfossilfuelsinourcars,fossilfuelisburnedtoextractfossilfuelfromtheEarth,andfossilfuelisusedtoprocessfossilfuelintoitsindividualcomponents.Everystepofthewayreleasessulfurandnitrogenoxides,carbonmonoxide,heavymetals,andparticulatesintotheair.Eachstepintheprocessincreasesthenumberofasthmacasesintheworld,raisesaperson’schanceofhavingcancer,andincreasesthechancethatyourchildwillbebornwithcongenitaldefects.

　　TheEarthitselfcontributestoairpollutionthroughvolcaniceruptions,wildfires,andothernaturalprocess,butitiscapableofrecoveringfromthosesources.Ashumanscontinuetoindustrializewithadependenceonfossilfuels,wecontinuetoputourplanet’sfutureinjeopardyandshortenthelongevityofourspecies.

　　这是另一篇比较容易的

　　Airpollutionisoneofthevirtualproblemnowadays.Therearemanyreasonsofitbutmostlyitiscausedbycars,growingcities,developmentofeconomyandindustrialization.

　　Cleanairconsistofseveralgases.Whensomeothergasesordangerouselementsgetintothecleanair,pollutionisinevitable.Ozonelayerisaffectedtoomuchbypollutionanditwillcauseseriousdisturbancesontheenvironment.

　　Peoplearethemaincauseofpollutionbecausethethingsthatweusecontaindangerouschemicalsandtheymakeatmospheredirtier.Furthermoreclimatechangesbecauseofpollution.

　　Manysubstancesinvolvedinthethingsthatpeopleuse,pollutetheairseriously.Forinstance,cigarettescontaincarbonmonoxide.Itoccurswhenwoodorpetrolarenotburned.Anotheroneiscarbondioxideanditemergeswhenweburncoalorwood.Whenthesegasescontactwithatmosphere,o

　　谢谢。