PART F	Maximum Allowable Emissions Limits for Motor Vehicle Exhaust, Evaporative and Visible Emissions for Light-Duty and Heavy-Duty Vehicles
In order for a vehicle (owner) to obtain a Certificate of Emissions Compliance, the exhaust and evaporative emissions from the motor vehicle subject to an EPA approved emissions test as specified in Part C of this regulation may not exceed the applicable maximum concentrations or if applicable, maximum mass for exhaust carbon monoxide (CO), hydrocarbons (HC) and oxides of nitrogen (NOx); and the integrity requirements specified for fuel evaporation control and visible smoke.
I.	LIGHT-DUTY VEHICLES (INCLUDING LIGHT-DUTY TRUCKS) SUBJECT TO IDLE SHORT TEST(S)

I.A.	Maximum Concentration Limits for Light-Duty Vehicles (Includes Light-Duty Trucks)

Model Year	Percent Carbon Monoxide	Parts/million Hydrocarbon	
1970 and earlier	3.5	1000	
1971	3.0	1000	
1972	3.0	1000	
1973	3.0	1000	
1974	3.0	1000	
1975	2.0	600	
1976	2.0	600	
1977	1.5	400	
1978	1.5	400	
1979	1.5	400	
1980	1.5	400	
1981 and newer	1.2	220	
II.	HEAVY-DUTY VEHICLES (1978 AND EARLIER GREATER THAN 6000 LBS. GVWR) SUBJECT TO IDLE SHORT TEST(S)
II.A.	Maximum Concentration Limits for Heavy-Duty Vehicles

Model Year	Percent Carbon Monoxide	Parts/million Hydrocarbon	
1967 and earlier	7.0	1500	
1968	6.5	1200	
1969	6.5	1200	
1970	5.5	1000	
1971	5.5	1000	
1972	5.5	1000	
1973	5.5	1000	
1974	5.5	1000	
1975	5.5	1000	
1976	5.5	1000	
1977	5.5	1000	
1978	5.5	1000	
 	 	 	
Heavy-Duty Vehicles (1979 and Newer Greater Than 8500 lbs. GVWR) Subject to Idle Short Test(s)	
1979	4.0 	800	
1980	3.5 	800	
1981	3.0 	600	
1982	3.0 	600	
1983	3.0 	600	
1984	3.0 	600	
1985 	3.0	600	
1986 and newer	2.0	300	
III.	TRANSIENT TEST MASS EMISSIONS LIMITS IN GRAMS/MILE (GPM)
III.A.	Light-duty vehicles (excluding light-duty trucks)

MODEL YEAR	HC	CO	NOx	
1982	3.5	45.0	5.0	
1983	3.5	30.0	4.5	
1984	3.0	30.0	4.5	
1985	2.5	20.0	4.5	
1986	2.5	20.0	4.5	
1987	2.5	20.0	4.0	
1988	2.0	20.0	4.0	
1989	2.0	20.0	4.0	
1990	2.0	20.0	3.5	
1991	1.5	20.0	3.5	
1992	1.5	15.0	3.5	
1993	1.5	15.0	3.5	
1994	1.2	15.0	3.0	
1995	1.2	15.0	2.5	
1996	1.2	15.0	2.0	
1997	1.2	15.0	2.0	
1998	1.2	15.0	1.5	
1999 and newer	1.2	15.0	1.5	
III.B.	Light-Duty Trucks (equal to or less than 8,500 lbs. G.V.W.R.)

MODEL YEAR	HC	CO	NOx	
1982	6.0	65.0	6.0	
1983	6.0	65.0	6.0	
1984	5.0	55.0	6.0	
1985	4.5	45.0	6.0	
1986	4.0	40.0	6.0	
1987	3.5	30.0	5.5	
1988	3.0	25.0	5.0	
1989	3.0	25.0	5.0	
1990	3.0	25.0	5.0	
1991	2.5	25.0	4.5	
1992	2.5	25.0	4.5	
1993	2.5	25.0	4.5	
1994	2.0	20.0	4.0	
1995	2.0	20.0	4.0	
1996	1.2	15.0	3.5	
1997	1.2	15.0	3.0	
1998	1.2	15.0	2.5	
1999 and newer	1.2	15.0	2.0	
III.C.	REPEALED
IV.	EVAPORATIVE EMISSIONS CONTROL STANDARDS
System Integrity - A gas cap integrity check to assess the degree of leakage between the fuel filler neck sealing surface and the gasoline cap sealing surface shall be performed on all model year 1975 and newer vehicles.
IV.A.	Pressure decay of the gasoline cap to filler neck sealing surfaces shall not exceed six (6) inches of water over a ten (10) second period, or
IV.B.	The gasoline cap flow rate shall be compared to an orifice with a National Institute of Standards and Technology (NIST) traceable flow rate that will result in a pass/fail flow rate threshold of 60 cc/minute of air at 30 inches of water (column).
V.	VEHICLES SHALL NOT EXHIBIT ANY CONTINUOUS GRAY, BLUE, BLUE-BLACK, OR BLACK SMOKE OF GREATER THAN 5% OPACITY FROM THE ENGINE CRANKCASE AND/OR TAILPIPE(S) DURING ANY ENGINE OPERATING CONDITION OF APPLICABLE INSPECTION PROCEDURES.
VI.	CLEAN SCREEN PROGRAM MAXIMUM ALLOWABLE EMISSIONS LIMITS
VI.A.	In order to obtain a Certificate of Emissions Control through the Clean Screen Program, vehicles must not exceed maximum emissions concentrations of 0.50 percent carbon monoxide (CO) and 200 parts per million hydrocarbon (HC) as reflected in remote sensing emissions readings.
VI.B.	Vehicle owners who participate in the Clean Screen Program shall not be subject to the provisions of this Part F other than this section VI.
VI.B.1.	On or before July 1st of each year the Air Pollution Control Division shall develop a low emitting vehicle index based on a tabulation of the previous calendar year’s IM240 inspection program results for specified make, model and model year of vehicles.
VI.B.2.	A 98% passing rate for exhaust emissions shall be set as the minimum allowable passing criteria for the low emitting vehicle index.
VI.B.3.	In developing the low emitting vehicle index, the Division may use passing criteria greater than 98% if necessary to ensure that the use of the low emitting vehicle index is equivalent to or better than the use of a second remote sensing measurement in terms of air quality benefits.
PART G	High Emitting Vehicle Identification Pilot Project
I.	Applicability
The provisions of this Part G shall apply to the following:
I.A.	All Motor Vehicles that are registered in the Enhanced Program Area and;
I.B.	All Motor Vehicles that regularly operate within the Enhanced Program Area but are registered outside the Enhanced Program Area.  For the purposes of this Part G, a Motor Vehicle is regularly operated within the Enhanced Program Area if it is identified by a Remote Sensing Device on four or more separate days within any consecutive 12-month period.
II.	Definitions
II.A.	“Clean Screen Test” means the emission test conducted under the Clean Screen Program.
II.B.	“Compliance Test” means the emission tests and inspection procedures conducted under section VI. 
II.C.	“Contractor” shall have the same meaning as set forth in section 42-4-304(5), C.R.S.
	II.C.	“Enhanced Inspection Center” shall have the same meaning as set forth in section 42-4-304(10), C.R.S.
II.D.	“Enhanced Program Area” means the area as identified in section 42-4-304(20)(c), C.R.S.
II.E.	“High Emitting Vehicle” means a vehicle that exceeds the Remote Sensing Standards set forth in section IV and subsequently fails the Compliance Test Standards set forth in section VI.
II.F.	“Motor Vehicle” shall have the same meaning as set forth in section 42-4-304(18), C.R.S.
II.G.	“Periodic Inspection Test” means the emission tests and inspection procedures required as part of the vehicle registration process under this Regulation No. 11 and conducted at an Enhanced Inspection Center or Inspection-only Facility. The term Periodic Inspection Test does not include Clean Screen Tests.
II.H.	“Remote Sensing Device” means an apparatus, portable or permanent, used for collection of on-road vehicle emissions data and other data used to identify the vehicle as a potential high emitting vehicle.
III.	General Provisions
In addition to any other inspection and repair requirements under this Regulation No. 11, Motor Vehicles operating in the Enhanced Program Area shall be subject to inspection, repair and enforcement requirements in accordance with the provisions of this Part G.
III.A.	All Motor Vehicles operating in the Enhanced Program Area may be inspected using a Contractor operated Remote Sensing Device.  Such Remote Sensing Devices shall be operated in accordance with the provisions of section V.
III.B.	All Motor Vehicles registered in or regularly operating in the Enhanced Program Area shall meet the remote sensing standards set forth in section IV.  
III.C.	When a Motor Vehicle exceeds the remote sensing standards, the owner of that vehicle shall bring the vehicle to an Enhanced Inspection Center or other Division approved facility for compliance testing within thirty days after receiving notice that the Motor Vehicle exceeded the remote sensing standards.  compliance testing shall be conducted in accordance with the provisions of section VI.  To pass, the Motor Vehicle must meet the Compliance Test standards set forth in section VI.  Owners that fail to bring the vehicle in for compliance testing within the thirty day time period shall be subject to the penalty provisions of section VIII.  
III.D.	A Motor Vehicle that fails the Compliance Test shall be considered a High Emitting Vehicle and the owner of that vehicle shall be subject to the maintenance and repair and, as applicable, penalty provisions set forth in sections VII and VIII.  
IV.	Remote Sensing Standards
IV.A.	A Motor Vehicle’s emissions must not exceed 3.0% Carbon Monoxide (CO) or 550 ppm Hydrocarbons (HC), reported as hexane, as measured by a remote sensing reading for that Motor Vehicle.  For those vehicles that have been previously inspected, only readings conducted since the Motor Vehicle’s last passing Periodic Inspection Test, last passing Clean Screen Test or last passing Compliance Test, whichever is later, may be considered.
IV.B.	The Division may require that additional criteria beyond the emission concentration standards set forth in section IV.A. be met before a Motor Vehicle is identified as having exceeded the remote sensing standards and required to undergo compliance testing under this Part G.  These criteria may include, but are not limited to, requiring a minimum number of remote sensing readings, higher CO and/or HC concentration levels, ambient temperature criteria, vehicle specific power criteria, restricted time scope for valid remote sensing readings, use of high or low emitter indexes and consideration of a vehicle’s emissions inspection history.
V.	Remote Sensing Procedures
For the purposes of this Part G, remote sensing readings shall be conducted in accordance with the specifications, procedures, quality assurance requirements, calibration requirements and licensing standards applicable to Clean Screen Tests under 42-4-301 et. seq., C.R.S., Regulation No. 11, the contract between the Colorado Department of Public Health and Environment, Colorado Department of Revenue and the Contractor and the Division approved Remote Sensing Device Operators Manual.
VI.	Compliance Test Procedures and Standards
VI.A.	The Compliance Test for a Motor Vehicle shall be conducted at an Enhanced Inspection Center or other Division approved facility in accordance with the specifications, procedures, quality assurance requirements, calibration requirements and licensing standards that are applicable during a Periodic Inspection Test for that Motor Vehicle as set forth in this Regulation No. 11.
VI.B.	The Compliance Test standards for a Motor Vehicle shall be the same as the Periodic Inspection Test standards and limits applicable to that vehicle as set forth in this Regulation No. 11.  If a Motor Vehicle fails to meet any of the Periodic Inspection Test standards and limits it shall be deemed to have failed the Compliance Test.	 
VII.	Maintenance and Repair Requirements
Motor Vehicles that fail the Compliance Test standards set forth in section VI. shall have ninety days to repair and re-test the vehicle.  The re-test shall be conducted in accordance with the procedures and standards set forth in section VI. 
VIII.	Penalties
VIII.A.	   When a Motor Vehicle exceeds the remote sensing standards, the owner of that vehicle shall bring the vehicle to an Enhanced Inspection Center or other Division approved facility for compliance testing within thirty days after receiving notice that the Motor Vehicle exceeded the remote sensing standards.  
VIII.A.1.  The registration for any vehicle that fails to appear at an Enhanced Inspection Center or other Division approved facility for compliance testing within thirty days after receiving notification of the exceedance of the remote sensing standards shall be subject to administrative suspension in accordance with rules and procedures established by the Department of Revenue.  The registration may not be reinstated until the vehicle owner provides proof that the Motor Vehicle has either passed a Compliance Test that meets the requirements of section VI, or has obtained a waiver from the Department of Revenue in accordance with the waiver requirements applicable to Periodic Inspection Tests, and pays any fine assessed under section VIII.A.2.
VIII.A.2.  The owner of a Motor Vehicle that fails to appear at an Enhanced Inspection Center or other Division approved facility for compliance testing within thirty days after receiving notice that the Motor Vehicle exceeded the remote sensing standards shall be subject to a one hundred dollar fine assessed in accordance with rules and procedures established by the Department of Revenue.
VIII.B.	   When a Motor Vehicle fails the Compliance Test standards set forth in section VI., the owner of that vehicle shall have ninety days after receiving notification of the test failure to either pass a subsequent Compliance Test, or obtain a waiver from the Department of Revenue in accordance with the waiver requirements applicable to Periodic Inspection Tests.
VIII.B.1.  The registration for any vehicle that does not pass a subsequent Compliance Test within the ninety-day time period, or obtain a waiver from the Department of Revenue in accordance with the waiver requirements applicable to Periodic Inspection Tests, shall be subject to administrative suspension in accordance with rules and procedures established by the Department of Revenue.  The registration may not be reinstated until the vehicle owner provides proof that the Motor Vehicle has either passed a Compliance Test that meets the requirements of section VI, or has obtained a waiver, and pays any fine assessed under section VIII.B.1.
VIII.B.2.  The owner of a Motor Vehicle that does not pass a subsequent Compliance Test or obtain a waiver within ninety days after receiving notification of the initial Compliance Test failure shall be subject to a one hundred dollar fine assessed in accordance with rules and procedures established by the Department of Revenue.
IX.	Repeal
This Part G shall be repealed effective July 1, 2010.
XXI.	AMENDMENTS ADOPTED MARCH 20, 2008.
Basis and Purpose
The purpose of this rulemaking is to implement revised, more stringent, model year emissions standards.  It is expected that this revision will result in increased air quality benefits generated by the inspection and maintenance program.  Another purpose of this revision is to delete obsolete language and correct minor typographic errors.
The effect of the rule change is to identify more high emitting motor vehicles.  Emissions reductions generated by the repair of these vehicles are expected to assist in reducing summertime ozone concentrations.  The state this summer violated the national ambient air quality standards for ozone, making necessary these modifications.  The provisions amended in this rule change are not more stringent than federal requirements.
Specific Statutory Authority
The Commission promulgates these regulatory changes pursuant to its authority to authority to set emissions standards as provided by section 42-4-306(6)(b)(I), C.R.S.  Additional authority is set forth in section 42-4-306(1), C.R.S., which gives the Commission the authority to adopt regulations as may be necessary to implement the emissions testing program. 
Scientific/Technical Rationale
The rule is based on reasonably available, validated, reviewed, and sound scientific methodologies including analysis of existing emission testing data and EPA approved mobile source emissions modeling.  It will result in demonstratable reductions in ozone precursor emissions, and should help reduce the risk to human health or the environment from high ozone levels in the Denver Metro Area.  Among the options considered, the regulatory option chosen will maximize the air quality benefits in the most cost-effective manner.