### STATEMENT OF THE MANUFACTURERS OF EMISSION CONTROLS ASSO.CIATION ON THE ENVIRONMENTAL PROTE C TION AGENCY'S PROPOSAL: GREENHOUSE GAS EMISSIONS STANDARDS AND FUEL EFFICIENCY STANDARDS FOR MEDIUM- AND HEAVY -DUTY ENGINES AND VEHICLESPHASE2 Augus t 6, 20 15 M y nam e is Dr
. J ose ph Kub s h. I am th e Exec uti ve Direc to r o f th e M a nu fac ture rs o f E mi ss ion C ontro ls A ssoc ia tion , o r MEC A . M ECA is pl ease d to pro v id e c o mm e nt s in s upp o rt of the U.S
. EPA ' s prop ose d ru le making to es tabli s h m e dium- and heav y -duty g re e nhouse gas e mi ss ion s tandard s and c o rporate average fue l e conomy s tandards for m o d e l ye ar s 

### 20 1 8 and b e yond
. We beli e v e an important opportunit y ex is t s to cont inu e to r e du ce g ree nhouse gas e mi ss ion s and improve f u e l eco n o my from m e dium- a nd he a v y-dut y e n g in es a nd ve hicle s b y a p p ly in g th e fundam e nt a l r egu la to ry stru ct ure th a t h as b ee n e ff ec ti ve und e r th e fir s t pha se of th e medium a nd h eavy -dut y s ta nd ard s. ME CA is a n o n-pro fit asso ci a ti o n o f th e wo rld' s l ea din g m a nu facture rs of e mi ss io n co ntro l t ec lmo l ogy fo r m ob il e so urces . Our m e mb e rs have ov er 

### 40 years o f ex p e ri e nc e and a prove n trac k record in d eve lopin g and m anu fac turin g e mi ss ion control a nd e ffi c ie nc y technol ogy fo r a wide variety of on- ro a d and off-road g a so lin e and di es el fueled vehicl es a nd e quipment in a ll wo rld markets . N o w th a t reg ulated po llu tant s h a v e b ee n ex pande d to in c lud e C0 2 , the po rtf o li o of pr o du c t s of f e re d b y our m e mb e rs h as ex p a nd e d to tec hn o log ies th a t imp ac t co mbu s ti o n e ffi c ie n cy a nd impr ove th e ove ra ll C0 2 e mi ss io n s o f th e p owe rtr a in
. Th es e tec hn o log ie s in c lu de waste heat r ecove ry , t urboc h a rge rs , turb o - co mp o un d in g , EG R coo l ers , E G R va lves and o th er a ir m a n age m e nt tec hn o log i es , th e rm a l man agem e nt s tra teg ies in c ludin g in s ul ated du a l wa ll m a nif o ld s and e xh a u s t sys te m s , ac ti ve th e rmal m an age m e nt a pproach es , a d v an ced fu e l inj ec ti o n a nd ig niti o n s ys te m s. Th e m o bil e s ourc e e mi ss io n s co ntrol indus try h as ge ne rated hundre d s of billion s o f dollar s in U
. S
. eco nomi c activity s in ce 

### 1 9 7 5 a nd s upport s m o re th a n 

### 6 5, 000 U
. S
. job s , m os tl y in product d e v e lopm e nt a nd manufacturin g . E PA's propos e d Ph ase 

### 2 emis s ion s a nd e ffi c ien cy s tandard s will pro v id e a dditional s upp o r t f o r th e c ontinu e d deve lo pm e nt of a thrivin g U
. S
. indu s try f oc u se d o n a w id e rang e of tec hn o log ies th a t c a n re du ce v e hi c le e mi ss ion s an d imp rove fu e l e ffi c ie ncy . M ECA wou ld lik e t o offe r th e f o ll owin g co mm e nt s o n s p ec ifi c a s p ec t s of EP A's Pha se 

### 2 p r

o p osa l: 

### 1
. ME CA s tro n g ly s upp o rts th e continu e d u se of se parate e n g in e a nd v e hicle standard s includ e d by EPA in th e ir Pha se 

### 2 prop os al. Thi s fran1 e work d e v e l op e d for th e Pha se 1 h e a vy -duty s t a ndard s ensure s the c o ntinu e d important tes tin g link age b e twee n e n g in e c rite ri a a nd gree nhou se gas e mi ss i o n s , and e n s ur es th a t m a nuf ac turer s d e li ve r durabl e, e n fo r cea bl e impro ve m e nt s to tru c k fu e l e ffici e ncy . 

### 2. MECA be li eve s th a t cos t e ff ec ti ve t ec hni ca l so luti o n s w ill be ava il ab le t o all ow for th e f as te r 

### 2 0 2 4 impl e m e nt a ti o n tim e lin e in c l u d ed in EP A ' s p r opo s a l. Ma nu fac ture rsnee d this re g ulator y clarity to continue to make n ee ded investmen ts on technolo g ie s that wi ll delive r th ese redu c tion s. 3. MECA s upp o rt s EPA 's propo sa l to lower the cap on N 2 0 emission s from 10 0 to 50 m glb hp-hr. Thi s ti gh ter N20 cap w ill be challeng i ng i n the expecte d f uture of lowe r exhau st te mp eratures associate with impro ve d engi ne effic ien cies but manufacture rs h ave a numb er of te chnical opportunities available to them to kee p N2 0 e mi ss ions a t low leve ls, includin g impro ve d cata lyst formu lat ion s, ammonia s lip cata lysts with hi g h se lectivity for nitrogen form a tion , and e ffi c i e nt urea dosin g stra t eg ies . 4. M ECA s upp o rt s E PA's prop osa l to c lo se th e cu rr e nt e mis s ion s loop ho le on truck g li der kits. T h e legacy of dirt y die se l e n gines on Amer i c a 's road s needs to put in o ur rear view mirror. All new truck s need to util ize th e clean diese l e ng in e op ti ons th at h ave b ee n available s ince 20 10. MEC A asks EPA to co n side r a n ear li er closing of the g l ider truck loo pho le instea d of waiting until 2 0 1 8 to get th ese dirt y di ese l option s off the table
. 5. MECA belie ves that future auxiliary power unit PM emi ssions s ho uld b e controll ed through the applicati on of prov e n di ese l particul a t e filt er techn o lo gy t o these s m a ll o ff-road engi nes. Th ere are a lrea dy ex amples of s ma ll off-road di ese l eng in es e ngineered w ith filter s olution s that includ e acti ve rege nerat ion. E PA sho uld fo ll ow Ca lifornia 's l ea d and i mp le m e nt policies for APU e n g in es that forc e th e app l icati o n o f cost effectiv e filt e r solution s o n th ese engine s . F in a ll y, MECA b e li eves that s i g nifi cant furth e r reduc tion s in N O x e mi ss ions from nevv heav y- dut y o n-road die se l e n g in es b eyond th e 20 1 0 h ig hway re quirement s w ill b e possible thro u gh th e co mbinati o n s of more advan ced die se l e n g in es with evo lutionar y improvement s to the g rowin g s uite of advanced d iese l exhaust e mission contro l tec hnolo g ies in c luding hi g h cell densit y, low th e rmal m ass s ub str a te s, improv ed SCR cataly s t sys tems coat e d dire ctly on filt e r s ub st rate s, and advanced ox id at ion cata lysts that include pa ss ive NOx absorbe r capabi l i t i es. C lean di ese l e mission t ec hn o logies ha ve ex p anded and mature d consi d erab ly si nce EPA fin a li zed their heavy -du ty 2 007-2010 em i ss i o n s t andard s n earl y 15 years ago in late 2000. Th e application of SC R t ec hn o l ogy on die se l e n g in es ha s allowed e ng ine manuf ac tur ers to optimi ze die se l e n g in es for both low NOx emissions and improv e d fu e l efficiency and we believe that the se optimi zations can co nti n u e in th e future to allow di ese l e ngi n es to furth e r r e duc e both C0 2 and NOx e mi ss io n s. Adva nced di ese l emiss io n con trol techn o l ogies are c urrently bein g evaluated in a Californi a-s p o n so red te s t progra m to demo n s trat e t he cap abil iti es to m eet a 0.02 glbhp- hr NOx s tandard w ith o ut ne gative ly imp ac tin g C 0 2 e mi ss ions. Res ult s from thi s test pro g ram a re ex pe c t ed b e for e th e end of n ex t yea r. The e mi ss io n re duction b e n efits achieved through th e de ployment of a d vanced die se l e mi ss ion control t ec hnologi es a re focused on de li ve rin g NOx r ed u c ti o n s during the co ld tra n s i e nt porti on of th e test cyc le a nd to impro v in g NOx e mi ss i o n s pe rf ormance in low temp e ra ture duty-cycl e o p e r at io n s . Addi ti o na l NOx reduction s f rom hea vy -duty e ngines w ill prov id e imp ortant cos t -effective re du ct ion s for reg io n s of th e co untr y w ith c uiTe nt and future ozone no n-attainm e nt iss ue s . MECA as k s EP A to initi ate a ru le m ak in g that w ill furth e r r ed u ce NOx e m i ss ion s f rom he avy-duty e ng in es as soo n as po ss ib le t o a llow manufa c turers to work w ith their customer s on d e l i verin g fu ll y o ptimi zed future e n g in es th at d e l i ve r improved fu e l e ffi c i e ncy and ultr a- low N O x e mi ss io n s . CONTACT : Joseph K u b s h. Exec uti ve Dir ector MECA , E-mai l : jkub s h (@. m eca.on!

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