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1ResponsetoReviewer#3:Wewouldliketothankthereviewerforcarefulandthoroughreadingofthismanuscriptandforthethoughtfulcommentsandconstructivesuggestions,whichhelptoimprovethequalityofthismanuscript.Ourresponsefollows(thereviewer’scommentsareinitalics).GeneralComments.Thepaper‘AnoverviewoftheMILAGRO2006campaign:MexicoCityemissionsandtheirtransportandtransformation’byL.T.Molina,etal.isanoverviewoffindingsfromtheMILAGROfieldcampaign.However,itisnotjusta‘paperaboutpapers’butalsoprovidessomefurtheranalysisandattemptstoextractthemostimportantresults.Itisverywellwrittenandiswellbalancedbetweenthedifferenttopics,suchasexperimentaldesign,emissions,photochemistry,radiation,andtransport.ItdefinitelydeservestobepublishedandisavaluablecontributiontotheACPjournal.Theonlyweaknessofthepaperisitslength.Itistruethatsomeofthechapterscanberegardedasstand-alonedocuments,anditisthusnotnecessarytoreadthewholepaper.However,itismybeliefthatthemainpurposeofthepaper(overviewoftheMILAGROproject,roadmaptoitsnumerouspublications,bringingacrossthemainmessages)couldhavebeenachievedonlesspages,e.g.byomittingsomedetailsandratherreferthereadertooneormoreoftheMILAGROpublications.Itisdifficulttopointspecificallytoomittablesentencesastheyareratherspreadthroughoutthepaper,butIrecommendmakingonemoreefforttoshortenthepaperatleastsomewhat,inordertomakeitmorereadilyaccessible.Reply:Weappreciatethepositivefeedbackfromthereviewer.Withregardstothelengthofthearticle:aswenotedinourresponsetoReviewers#1and#2,itisnoteasytoshortenthearticle.Wearetryingtotargetbothreadersthatareinterestedinthecomprehensivestudyandreadersthatareonlyinterestedinsubsections.Thecurrentformservebothoftheseneedsandweareconcernedthatifwecutoutthesmalloverlapsintheintroductiontoeachsectionaswellasthetechnicalmaterial,thenthesubsectionswillnotbereadabletothereaderwhoisonlyinterestedinoneorafewsections.Thereforewewouldliketokeepthemanuscriptlargelyinitscurrentform.However,assuggestedbythereviewer,wehavereviewedcarefullytheentiremanuscriptandhaveremovedredundancies,asshownintherevisedmanuscript.Onemoregeneralremark:WhataboutcallingSection12‘SummaryandConclusions’andSection13‘Futurework’inordertobetterreflecttheircontent.Reply:Assuggestedbythereviewer,wehavechangedthetitleofSection12to“SummaryandConclusions”andSection13to“FutureResearch.”Minorcomments:1)p.7823,lines23-25:addalreadyherehowmanypartners,fromwhichcountries,durationandfundingagenciesReply:Assuggestedbythereviewer,wehavemovedtheinformationfromlastparagraphofpage7829topage7823.22)p.7824,line23:facilitates-facilitateReply:Thecorrectionhasbeenmade.3)p.7826,line14:removecolonafter‘showingthat’Reply:Thecorrectionhasbeenmade.4)p.7827,lines17-25:don’tneedtonamehereallconferencesandmedia,canbeshortened(whilekeepingthelinktothewebsite).Reply:Wehaveshortenedtheparagraph,assuggested.5)p.7827,line26andonwards:thisshouldbeintheintroduction.Reply:WehavemovedtheparagraphtotheIntroduction.6)p.7829,line24andonwards:thisiswhatIsuggesttoincludeintheintroduction(seefirstminorcommentabove)Reply:WehavemovedtheparagraphtotheIntroduction.7)p.7833,line12:‘andmore’-‘andamore’Reply:Thecorrectionhasbeenmade.8)p.7848,line25:remove‘is’Reply:Thecorrectionhasbeenmade.9)p.7850,line13:‘constrains’-‘constraints’,line19:commaaround‘respectively’Reply:Thecorrectionhasbeenmade.10)p.7853,lines2and3:write‘theUCIrvinegroup’and‘T0andT1sites’.Reply:Thecorrectionhasbeenmade.11)p.7854,line11:‘were’-‘was’Reply:Thecorrectionhasbeenmade.12)p.7864,line1:remove‘reflectsthepartitioningbetweenOHandHO2,and’Reply:Thetexthasbeenrevisedassuggested:“TheHO2/OHratiocanbeusedasameasureoftheefficiencyofradicalpropagation.”313)p.7865,line12:youmean‘earlyafternoon’?(asopposedtolateafternoonwhichisVOClimited)Reply:Thetexthasbeenrevisedassuggested:“AnanalysisofratioofradicallossfromtheformationofnitricacidandorganicnitratestothetotalradicalproductionforMCMA2003alsosuggeststhatozoneproductionisVOC-limitedintheearlymorningandlateafternoon,butbecomesNOx-limitedduringtheearlyafternoon[Maoetal.,2009].”14)p.7870,line18:‘composition’-‘compositions’,and:PMcoarseisshown,notPM2.5Reply:Thetextisindeedincorrect.ThesubjectfigureshowsPM2.5andPMCoarseandnotPM2.5andPM10asindicatedinthetext.Thesentencehasbeencorrectedtoread:“ThefractionalcompositionsofPM2.5andPMCoarseareillustratedinFig.12.15)p.7887,line1:‘leads’-‘lead’Reply:Thecorrectionhasbeenmade.16)p.7888,line2:move‘were’toafter‘aerosols’Reply:Thesuggestedcorrectionhasbeenmade.17)p.7890:Thesentencesinlines12and18,referringtoHodzicetal.,2009,Mugicaetal.,2009,andChristianetal.,2010,areverysimilar.Combine.Reply:Assuggestedbythereviewer,thesecondoccurrenceofthesecitationshasbeeneliminated18)p.7892,line5:‘Previouswork’referstothepast,and‘will’tothefuture.Ratherwrite‘missed’,or,e.g.,‘themethodusedinpreviouswork...didnotdetect’Reply:Thesuggestedcorrectionhasbeenmade.Thesentencenowreads:“Previousworkusingsinglewavelengths,particularlyatwavelengthslongerthan500nm,didnotdetectthesechangesinabsorptioninthe300to500nmrangethatareprimarilyduetooxidizedorganics(bot