"Table 4-30a:  Federal Exhaust Emission Certification Standards for Newly Manufactured Gasoline- and Diesel-Powered Light Duty Trucks (Category LDT1) a,b,c (Grams per mile)",,,,,,,,,,,,,,,,,,,,,
Engine type and ,Prior to ,1968-,1970-,,1973-,,1976-,1979-,1982-,,1985-,,1988-,Tier 1k,,,,Interim Tier 2k,,Tier 2k,
pollutant,controlg,1969,1971,1972,1974,1975,1978,1981,1983,1984,1986,1987,1993,1994,,1995-2003,,2004-2006,,2007+,
Gasoline,,,,,,,,,,,,,,,,,,,,,
HC (total),11,i,2.2,3.4,,2.0,,1.7,,0.80 ,,,,j,R(0.80),,,j,,,
  NMHC,h,j,,,,,,,,,,,,0.25,(0.31),,,j,,,
  NMOG,h,j,,,,,,,,,,,,,,,,0.125,(0.156),0.100,(0.125)
CO,80,i,23,39,,20,,18,,10,,,,3.4,(4.2),,,,,,
Cold-temp. COd,e,j,,,,,,,,,,,,10,j,,,,,,
NOx,4,j,,,3.0,3.1,,2.3,,,,,1.2,0.4,(0.6),,,,,0.14,(0.20)
Particulates,h,j,,,,,,,,,,,,,,0.08,(0.10),0.08,(0.08),0.02,(0.02)
Formaldehyde,h,j,,,,,,,,,,,,,,,,0.015,(0.018),,
Diesel,,,,,,,,,,,,,,,,,,,,,
HC (total),11,j,,,,,2.0,1.7,,0.80 ,,,,j,(0.80),,,j,,,
  NMHC,h,j,,,,,,,,,,,,0.25,(0.31),,,j,,,
  NMOG,h,j,,,,,,,,,,,,,,,,j,(0.156),0.100,(0.125)
CO,80,j,,,,,20,18,,10,,,,3.4,(4.2),,,j,(4.2),3.4,(4.2)
NOx,4,j,,,,,3.1,2.3,,,,,1.2,1.0,(1.25),,,j,(0.6),0.14,(0.20)
Particulates,h,j,,,,,,,0.60 ,,,0.26,,,,0.08,(0.10),j,(0.10),0.02,(0.02)
Formaldehyde,h,j,,,,,,,,,,,,,,,,j,(0.018),0.015,(0.018)
LDT1 weight criterae,,"GVWR up through 6,000 pounds",,,,,,"GVWR up through 8,500 pounds",,,,,"GVWR up through 6,000 lbs; LVW up through 3,750 pounds",,,,,,,,
Test procedure b,,7-mode,,CVS-72,,CVS-75,,,,,,,,,,,,,,,
"Useful life (intermediate) c,f",,j,,,,,,,,,,,,"5 years/50,000 miles",,,,"5 years/50,000miles",,,
                   (full),,"5 years/50,000 miles",,,,,,,,,"11 years/120,000 miles",,,"10 years/100,000 miles",,,,,,"10 years/ 20,000 miles",
KEY:  CO=carbon monoxide; GVWR=gross vehicle weight rating; HC=hydrocarbons; LVW=loaded vehicle weight; NMHC=nonmethane hydrocarbons; NMOG= nonmethane organic gases; NOx=nitrogen oxides. ,,,,,,,,,,,,,,,,,,,,,
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"a Light-duty truck categories LDT1-LDT4 were not  created until 1994.  From 1968 to 1978, all trucks with a GVWR up to 6,000 pounds were classified as light-duty trucks and were required to meet the same standards.  As of 1979, the maximum weight was raised to 8,500 pounds GVWR.  During 1988-93, light duty trucks were divided into two subcategories that coincide with the current LDT1-LDT4 categories.  The standards for LDT2, LDT3, and LDT4 are shown in tables 4-30b through 4-30d.",,,,,,,,,,,,,,,,,,,,,
"b The test procedure for measuring exhaust emissions has changed several times over the course of vehicle emissions regulation.  The 7-mode procedure was used through model year 1971 and was replaced by the CVS-72 procedure beginning in model year 1972.  The CVS-75 procedure became the test procedure as of model year 1975. While it may appear that total HC and CO standards were relaxed in 1972-74, these standards were actually more stringent due to the more stringent nature of the CVS-72 test procedure. Additional standards for CO and composite standards for NMHC and NOx tested over the new Supplemental Federal Test Procedure will be phased-in beginning with model year 2000.   These standards are not shown in this table.",,,,,,,,,,,,,,,,,,,,,
"c Emissions standards had to be met for a useful life of 5 years/50,000 miles through model year 1983, and a full useful life of 11 years/120,000 miles was defined for 1985-93 (several useful life options were available for 1984).  Beginning in model year 1994, emissions standards were established for an intermediate useful life of 5 years/50,000 miles as well as a full useful life (full useful life standards are shown in parentheses).  HC standards, however, were established only for full useful life. Tier 1 exhaust standards, except particulates standards, were phased in during 1994-96 at a rate of 40%, 80%, and 100%, respectively. PM standards were phased-in at a rate of 40%, 80%, and 100% during 1995-97.",,,,,,,,,,,,,,,,,,,,,
"d The cold CO emissions standard is measured at 20 degrees F (rather than 75 degrees F) and is applicable for a 5-year/50,000-mile useful life.",,,,,,,,,,,,,,,,,,,,,
e GVWR is the maximum design loaded weight.  LVW is the curb weight (nominal vehicle weight) plus 300 pounds.,,,,,,,,,,,,,,,,,,,,,
"f Manufacturers can opt to certify vehicles for a full useful life of 15 years/150,000 miles and either have (1) intermediate useful life standards waived or (2) receive additional NOx credits.",,,,,,,,,,,,,,,,,,,,,
"g The ""Prior to controls"" column reports emissions estimates of a typical newly manufactured car in the years before exhaust emissions certification standard were implemented.",,,,,,,,,,,,,,,,,,,,,
h No estimate available.,,,,,,,,,,,,,,,,,,,,,
"I In 1968-69, exhaust emissions standards were issued in parts per million rather than grams per mile and are, therefore, incompatible with this table.",,,,,,,,,,,,,,,,,,,,,
j No standard has been set.,,,,,,,,,,,,,,,,,,,,,
"k The term ""tier"" refers to a level of standards for specific years.  Interim Tier 2 refers to an intermediate level of standards that move manufacturers toward compliance with Tier 2 standards. Interim Tier 2 and Tier 2 standards are established as ""bins."" Each bin is a set of standards for NOx, CO, NMOG, formaldehyde, and particulates (HC and NMHC standards are dropped for Tier 2 and Interim Tier 2). Manufacturers may certify any given vehicle family to any of the bins available for that vehicle class as long as the resulting sales-weighted corporate average NOx standard is met for the full useful life. The Tier 2 corporate average NOx standard is 0.07 grams/mile. Interim corporate-based average NOx standards are based on vehicle type. The interim corporate sales-weighted average for LDT1 vehicles is  0.3 grams/mile. Tier 2 standards will be phased in at a rate of 25% in 2004, 50% in 2005, 75% in 2006, and 100% in 2007. During this period, all LDT1 vehicles not meeting the Tier 2 standards must meet Interim Tier 2 standards. ",,,,,,,,,,,,,,,,,,,,,
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SOURCE:,,,,,,,,,,,,,,,,,,,,,
"40 CFR 86, Subpart A (July 1, 2000) Federal Register, Vol. 65, No. 28, pp. 6851-6858.",,,,,,,,,,,,,,,,,,,,,
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