Title 18 . Environmental Conservation

Chapter 52 . Administrative Enforcement

Section 50. Emissions standards

18 AAC 52.050. Emissions standards

(a) For a vehicle to pass an I/M program inspection, it must

(1) have emissions levels at or below the standards in this section and 18 AAC 52.055; this requirement does not apply to light-duty 1996 or newer model year vehicles unless that vehicle's make, model, and model year has been exempted from the requirement for the OBDII portion of an I/M test due to a documented problem with the OBDII system of that specific make, model, and model year;

(2) have no missing, modified, disconnected, improperly connected, or defective emissions-related parts identified by the mechanic during a visual or functional check or identified by the vehicle's OBDII system; and

(3) pass the OBDII portion of an I/M test if the vehicle is a light-duty 1996 or newer model year; reasons for failure of the OBDII portion of the I/M test include the vehicle's

(A) MIL being commanded on;

(B) second failed readiness evaluation in an inspection cycle;

(C) OBDII connector being either damaged or not accessible; and

(D) OBDII system not responding to a command for communication.

(b) A vehicle that does not meet the requirements of 40 C.F.R. 85.2207, as revised as of July 1, 1998, adopted by reference, fails the OBDII check.

(c) A motorist whose vehicle has a missing, modified, disconnected, improperly connected, or defective emissions-related part shall repair the vehicle as required under 18 AAC 52.015 and 18 AAC 52.065.

(d) Unless an implementing agency imposes an alternative standard under 18 AAC 52.055, the standards set out in this section and illustrated in Figure 3 in Part IV, g and Appendix B of the program manual may not be exceeded in an I/M area.

(e) For LDGVs as defined in Table 1 of 18 AAC 52.037(b) , emissions standards for carbon monoxide, expressed as the percentage of carbon monoxide in the undiluted exhaust, are as follows:

(1) 1968 to 1971 model years: 5.0 percent at curb idle and 4.0 percent at 2500 rpm;

(2) 1972 to 1974 model years: 4.0 percent at curb idle and 3.0 percent at 2500 rpm;

(3) 1975 to 1980 model years: 2.0 percent at both curb idle and 2500 rpm;

(4) 1981 to 1993 model years: 1.0 percent at both curb idle and 2500 rpm;

(5) 1994 and newer model years: 0.5 percent at both curb idle and 2500 rpm.

(f) For LDT1 and LDGT2s as defined in Table 1 of 18 AAC 52.037(b) , emissions standards for carbon monoxide, expressed as the percentage of carbon monoxide in the undiluted exhaust, are as follows:

(1) 1968 to 1972 model years: 5.0 percent at curb idle and 4.0 percent at 2500 rpm;

(2) 1973 to 1978 model years: 4.0 percent at curb idle and 3.0 percent at 2500 rpm;

(3) 1979 to 1983 model years: 2.0 percent at both curb idle and 2500 rpm;

(4) 1984 to 1993 model years: 1.0 percent at both curb idle and 2500 rpm;

(5) 1994 and newer model years: 0.5 percent at both curb idle and 2500 rpm.

(g) For HDGVs as defined in Table 1 of 18 AAC 52.037(b) , emissions standards for carbon monoxide, expressed as the percentage of carbon monoxide in the undiluted exhaust, are as follows:

(1) 1968 to 1973 model years: 5.0 percent at both curb idle and 2500 rpm;

(2) 1974 to 1993 model years: 4.0 percent at both curb idle and 2500 rpm;

(3) 1994 and newer model years: 1.0 percent at both curb idle and 2500 rpm.

(h) For LDGVs, LDGT1s, and LDGT2s as defined in Table 1 of 18 AAC 52.037(b) , emissions standards for hydrocarbons, expressed as the concentration of hydrocarbons in the undiluted exhaust, are as follows:

(1) 1968 to 1983 model years: 1,000 parts per million at both curb idle and 2500 rpm;

(2) 1984 to 1993 model years: 750 parts per million at both curb idle and 2500 rpm;

(3) 1994 and newer model years: 220 parts per million at both curb idle and 2500 rpm.

(i) For HDGVs as defined in Table 1 of 18 AAC 52.037(b) , emissions standards for hydrocarbons, expressed as the concentration of hydrocarbons in the undiluted exhaust, are as follows:

(1) 1968 to 1993 model years: 1,000 parts per million at both curb idle and 2500 rpm;

(2) 1994 and newer model years: 220 parts per million at both curb idle and 2500 rpm.

(j) Each rotor of a rotary engine is the equivalent of one cylinder in determining the applicable emission standards under this section.

(k) Except as provided in (1) of this section, a model year 1975 or newer vehicle equipped with an engine other than the engine originally installed by the manufacturer or an identical replacement of that engine must meet the following requirements to qualify for a certificate of inspection under this chapter:

(1) the resulting engine-chassis configuration must have been certified by either the EPA or the CARB as having emissions that are the same as, or lower than, the original engine-chassis configuration installed in the vehicle;

(2) the emissions controls that were originally installed on the vehicle, as certified by the EPA or the CARB, must be retained on the vehicle;

(3) if the vehicle was originally equipped with one or more catalytic converters, the resulting engine-chassis configuration must be equipped with either the catalytic converter certified by the EAP or the CARB for that configuration or a replacement catalytic converter approved by the implementing agency; and

(4) if the vehicle was originally equipped with feedback controls and an evaporative emissions control system, that system must remain functional on the resulting engine-chassis configuration.

( l ) Instead of meeting the requirements of (k) of this section, a motorist may submit the results of an emissions test performed on a vehicle described in (k) using the FTP or an alternate loaded mode mass emissions test procedure approved by the department. The implementing agency shall issue a certificate of inspection after receiving adequate proof that the vehicle has a mass emissions rate that is the same as, or lower than, the engine-chassis configuration originally installed in the vehicle.

History: Eff. 2/1/94, Register 129; am 6/24/94, Register 130; am 1/1/98, Register 144; am 1/1/2000, Register 152; 12/30/2000, Register 156; am 3/27/2002, Register 161

Authority: AS 46.03.020

AS 46.14.030

AS 46.14.510

Editor's note: Listings of EPA-approved engine-chassis combinations are set out in a publication entitled Federal Certification Test Results for 19_ [the publication is model-year specific] Model Year for each vehicle model year of interest and may be purchased from the United States Department of Commerce, National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161, telephone (703) 487-4600, (703) 487-4650, or (800) 553-6847 (sales).