commiss direct novemb adapt technic progress council direct eec march approxim law member state relat measur air pollut gase posit ignit engin motor vehicl eec commiss european commun regard treati establish european econom commun regard council direct eec februari approxim law member state relat type approv motor vehicl trailer amend act access articl thereof regard council direct eec march approxim law member state relat measur air pollut gase posit ignit engin amend abovement act access articl thereof programm action european commun environ adopt novemb amend direct adopt account latest scientif progress refer air pollut exhaust gase posit ignit engin technic progress made construct posit ignit engin council direct eec laid permiss limit carbon monoxid unburnt hydrocarbon emiss engin limit made stringent council direct eec enabl permiss limit laid nitrogen oxid emiss essenti emiss pollut motor vehicl restrict effect order establish basi coher commun action reduc limit pollut subject eec type approv procedur vehicl order protect public health environ advis envisag reduct limit pollut work progress concret result measur provid direct accord opinion committe adapt technic progress oj oj oj oj direct remov technic barrier trade motor vehicl sector adopt direct articl annex iii council direct eec approxim law member state relat measur air pollut gase posit ignit engin motor vehicl amend council direct eec amend accord annex direct articl april member state ground relat air pollut gase engin refus grant eec type approv issu document refer indent articl direct eec grant nation type approv type motor vehicl prohibit entri servic vehicl level gaseou pollut emit type motor vehicl vehicl meet requir direct eec amend direct octob member state longer issu document provid indent articl direct eec respect type motor vehicl emit gaseou pollut level meet requir direct eec amend direct refus nation type approv type motor vehicl emit gaseou pollut level meet requir direct eec amend direct octob member state prohibit entri servic vehicl emit gaseou pollut level meet requir direct eec amend direct januari member state put forc requir need order compli direct forthwith inform commiss thereof articl direct address member state brussel novemb commiss finn gundelach member commiss annex amend annex direct eec annex definit applic eec type approv test specif item replac quot gaseou pollut quot gaseou pollut quot mean carbon monoxid hydrocarbon nitrogen oxid express nitrogen dioxid equival quot sentenc item replac quot test mass carbon monoxid mass hydrocarbon mass nitrogen oxid obtain vehicl refer weight amount shown tabl quot gt pic file quot quot gt item ad item quot octob applic vehicl categori vehicl equip automat transmiss limit nitrogen oxid emiss tabl item multipli factor quot exist item item item word quot pollut quot replac quot pollut quot item gt pic file quot quot gt item ad item quot octob applic vehicl categori vehicl equip automat transmiss limit nitrogen oxid emiss tabl item multipli factor quot annex iii type test sentenc item replac quot connect tube made stainless steel provid rigid connect quot item word quot reduct minimum condens side sampl bag bag quot delet item ad item quot cool condens locat exhaust pipe engin inlet bag ga temperatur tg exit condens maintain limit gt pic file quot quot gt cool system design avoid entrain condens water gase flow enabl humid gase sampl bag maintain total volum collect system exclud bag exce volum bag spreader pipe quot exist item item sentenc item replac quot carbon monoxid hydrocarbon analys dispers type absorpt infra red quot item ad item quot nitrogen oxid analys gase contain bag pass convert reduc nitrogen dioxid nitric oxid nitric oxid content gase emerg convert determin mean chemiluminesc analys ga dry devic ic trap upstream analys quot item ad item quot convert effici quot exist item item item replac quot condit bag quot sentenc item word quot bag quot replac quot bag quot item ad item quot air blown bag test order remov residu moistur quot item ad item quot check convert effici effici convert check method method quot quot sampl bag collect sampl exhaust gase fill air oxygen refer ga meter enabl mixtur ly measur rang analys obtain oxygen ad enabl good proport convert bag shaken briskli immedi connect sampl feed devic analys nox concentr measur turn minut interv altern pass sampl convert bypass tube minut presenc nox record shown diagram convert function properli quantiti increas sum nox remain constant reduct amount nox oper proce sign effici convert decreas determin devic gt pic file quot quot gt method quot quot effici convert verifi aid ozon accord diagram method set gt pic file quot quot gt analys connect tube receiv side suppli calibr ga mixtur proport full scale instrument side suppli ozon oxygen air depend concentr inlet pipe suppli provid shut valv sov inlet pipe connect meter valv mv flowmet begin check sov close mv set obtain steadi read chemiluminesc instrument set quot bypass quot devic span calibr correctli concentr ga sampl note read ozon sov open flow rate regul reduc figur analys figur note ozon switch voltag regul instrument read fall initi obtain dilut ga figur note analys switch quot convert quot read note ozon switch read note sov close read instrument note read ident initi ga sampl case figur higher effici convert express percentag gt pic file quot quot gt effici convert check week prefer dai quot item item sentenc ad item quot purpos determin correct volum case nitrogen oxid ph equal quot item ad item quot correct quot nitrogen dioxid quot content nitrogen dioxid content gase correct mean formula gt pic file quot quot gt cm measur nitrogen dioxid content cc correct nitrogen dioxid content absolut humid express gram water kilogram dry air absolut humid formula gt pic file quot quot gt ra rel humid ambient air pd satur water vapour pressur ambient temperatur measur dry bulb thermomet pb barometr pressur pressur pd pb express unit quot exist item replac item quot mass gaseou pollut contain bag mass gaseou ollut contain bag determin mean product content unit volum densiti gaseou pollut consider correct volum replac case nitrogen oxid carbon monoxid hydrocarbon hexan nitrogen oxid quot exist item item