Chile: Heavy-Duty Engines

Engine Emission Standards
Chassis Compliance Option

Engine Emission Standards

Emission standards for heavy-duty truck and bus engines [2951] are listed in Table 1. These apply to motor vehicles with a gross vehicle weight greater than or equal to 3,860 kg and that are designed to transport people or cargo on streets and roads. Early standards applied to vehicles operating in the Santiago Metropolitan Region (RM) and Region IV to X. Nationwide standards took effect in 2006. While emission standards for heavy-duty diesel vehicles have progressively become more stringent, those of Otto cycle/SI heavy-duty engines have remained stagnant.

In cases where dual standards exist, engines must meet either the EU-based or the US-based compliance option. Engines are tested on the respective EU (ESC+ETC) or US (FTP) engine dynamometer test cycles, as indicated.

National emission standards based on US EPA 2010 and Euro VI and applicable to compression ignition and spark ignition heavy-duty engines were proposed in 2022 and finalized in 2024 [5806][6236]. These standards take effect January 6, 2026 and apply to all heavy-duty vehicles.

For heavy-duty vehicles first registered January 2012 but prior to the EPA 2010/Euro VI standards taking effect and operating in the Metropolitan Region, PM emissions were limited to Euro IV/US 2007 levels while NOx limits for these vehicles remained at Euro III/US 1998 levels. In addition to OEM vehicles produced to meet the 2012 PM requirements, the limit could also be met by engines originally certified to PM emissions higher than the levels shown if they have been fitted with a diesel particulate filter carrying an approval by the Swiss Federal Office for the Environment (FOEN) or California ARB Level 3 verification and if the engine’s certification PM emissions multiplied by (1 - filter efficiency/100) does not exceed the limits shown. It should be reinforced that this is not a retrofit requirement for vehicles first registered prior to 2012 but a compliance option for those first registered after January 2012.

**Table 1**
Emission standards for heavy-duty engines, GVW ≥ 3,860 kg
Date & Applicability	CO	HC	NOx	PM	Unit	Test	Reference
Diesel Engines
1994.09: RM & IV-X	4.5	1.1	8.0	0.36^a	g/kWh	ECE R-49	Euro I
1994.09: RM & IV-X	15.5	1.3	6.0	0.35	g/bhp-hr	US FTP	US 1991
1998.09: RM & IV-X 2006.05: National	4.0	1.1	7.0	0.15	g/kWh	ECE R-49	Euro II
1998.09: RM & IV-X 2006.05: National	15.5	1.3	5.0	0.10	g/bhp-hr	US FTP	US 1994
2006.10: RM & IV-X†	2.1	0.66	5.0	0.10 (0.13*)	g/kWh	ESC	Euro III
	5.45	0.78	5.0	0.16 (0.21*)	g/kWh	ETC	Euro III
	15.5	1.3	4.0	0.10	g/bhp-hr	US FTP	US 1998
2012.01: RM	2.1	0.66	5.0	0.02	g/kWh	ESC	Euro III/Euro IV PM
	5.45	0.78	5.0	0.03	g/kWh	ETC	Euro III/Euro IV PM
	15.5	1.3	4.0	0.01	g/bhp-hr	US FTP	US 1998/US 2007 PM
RM, II-X & XIV 2012.06 2013.09: Urban buses outside of RM	1.5	0.46	3.5	0.02	g/kWh	ESC	Euro IV
	4.0	0.55^f	3.5	0.03	g/kWh	ETC	Euro IV
	15.5	2.4^d		0.01^e	g/bhp-hr	US FTP	US 2004/US 2007 PM
RM, II-X & XIV 2014.10: New models except urban buses 2015.09: Urban buses outside of RM 2015.10: All models	1.5	0.46	2.0	0.02	g/kWh	ESC	Euro V
	4.0	0.55^f	2.0	0.03	g/kWh	ETC	Euro V
	15.5	2.4^d		0.01	g/bhp-hr	US FTP	US 2004/US 2007 PM
Nationally 2026.01	1.5	0.13	0.40	0.01ⁱ	g/kWh	WHSC	Euro VI
	4.0	0.16	0.46	0.01^j	g/kWh	WHTC	Euro VI
	15.5	0.14^f	0.2	0.01	g/bhp-hr	US FTP [4010]	US 2010
Otto Cycle / SI Engines
1994.09: National, gasoline only	37.1	1.9	5.0	-	g/bhp-hr	US FTP
2004.01: RM, gaseous fuels only	5.45	0.78^b	5.0	-	g/kWh	ETC
2004.01: RM, gaseous fuels only	15.5	1.3^c	4.0	0.10	g/bhp-hr	US FTP
Nationally 2026.01	4.0	0.16^k	0.46	0.01^j	g/kWh	WHTC	Euro VI
Nationally 2026.01	37.1	1.9 1.7^g	1.0 5.0^h	-	g/bhp-hr	US FTP [4010]
* for engines of less than 0.75 dm³ swept volume per cylinder and a rated power speed of more than 3000 min^-1 † ETC testing and emission limits apply only to diesel engines with advanced aftertreatment, e.g., with particulate filters and/or NOx catalysts a - 0.612 g/kWh for engines < 85 kW b - NMHC for natural gas engines; natural gas engines must also meet a CH₄ limit of 1.6 g/kWh c - 1.2 g/bhp-hr NMHC for natural gas engines d - NMHC+NOx. An limit of 2.5 g/bhp-hr applies if NMHC do not exceed 0.5 g/bhp-hr e - PM limit depends on application: 0.01 g/bhp-hr applies to all vehicles with 3860 kg ≤ GVW < 15000 kg; 0.05 g/bhp-hr for urban buses with a GVW ≥ 15000 kg; and 0.10 g/bhp-hr for other vehicles with a GVW ≥ 15000 kg f - NMHC g – NMHC limit for natural gas engines h – natural gas engines only i - Engines must also meet a PN limit of 8.0×10¹¹ #/kWh j - Engines must also meet a PN limit of 6.0×10¹¹ #/kWh k - NMHC; engines must also meet a CH₄ limit of 0.50 g/kWh

All engines (diesel & SI) certified to Euro VI standards must also meet an NH₃ emission limit of 10 ppm over the WHSC and WHTC tests.

Gasoline and gas fueled trucks and buses have also an evaporative emission limit of 4 g per test.

Prior to the adoption of US 2004/Euro V limits, emission standards for urban buses operating in certain parts of the Santiago Metropolitan Region (Santiago Province and the municipalities of San Bernardo and Puente Alto) were more stringent than those listed in Table 1. These standards are listed in Table 2 [2950]. Urban buses first registered in September 2012 but prior to the EPA 2010/Euro VI standards taking effect for use in this region must be equipped with a factory installed OEM diesel particulate filter to ensure emissions do not exceed the limits equivalent to Euro IV or US 2004 NMHC+NOx/US 2007 PM [2949].

**Table 2**
Emission standards for urban buses in Metropolitan Region prior to adoption of US 2004/Euro V limits
Date	CO	HC	NOx	PM	Unit	Test	Reference
Diesel
1993.09	4.5	1.1	8.0	0.36^a	g/kWh	ECE R-49	Euro I
1993.09	15.5	1.3	6.0	0.25	g/bhp-hr	US FTP	US 1991
1996.09	4.0	1.1	7.0	0.15	g/kWh	ECE R-49	Euro II
1996.09	15.5	1.3	5.0	0.10	g/bhp-hr	US FTP	US 1994
2002.09†	2.1	0.66	5.0	0.10 (0.13*)	g/kWh	ESC	Euro III
	5.45	0.78	5.0	0.16 (0.21*)	g/kWh	ETC	Euro III
	15.5	1.3	4.0	0.05	g/bhp-hr	US FTP	US 1998
2012.09	1.50	0.46	3.5	0.02	g/kWh	ESC	Euro IV
	4.0	0.55	3.5	0.03	g/kWh	ETC	Euro IV
	15.5	2.4^d		0.01	g/bhp-hr	US FTP	US 2004/US 2007 PM
Gasoline
1993.09	37.1	1.9	5.0	-	g/bhp-hr	US FTP
Gaseous Fuels
2002.09	5.45	0.78^b	5.0	-	g/kWh	ETC	Euro III
2002.09	15.5	1.3^c	4.0	0.05	g/bhp-hr	US FTP	US 1998
* for engines of less than 0.75 dm³ swept volume per cylinder and a rated power speed of more than 3000 min^-1 † for Euro III diesel vehicles whose first application for registration is made before 2006.03, ETC testing and emission limits apply only to diesel engines with advanced aftertreatment, e.g., with particulate filters and/or NOx catalysts. ESC and ETC testing applies to all diesel vehicles whose first application for registration is made 2006.03 or later. a - 0.612 g/kWh for engines < 85 kW b - NMHC for natural gas engines; natural gas engines must also meet a CH₄ limit of 1.6 g/kWh c - 1.2 g/bhp-hr NMHC for natural gas engines d - NMHC+NOx. An limit of 2.5 g/bhp-hr applies if NMHC do not exceed 0.5 g/bhp-hr

Chassis Compliance Option

Changes to D.S. N° 55/1994 published in 2012 allowed diesel vehicles with 3860 ≤ GVW ≤ 6350 kg to alternatively certify complete vehicles according to the limits in Table 3 [2951]. (This option is equivalent to the US EPA provision that allowed an engine manufacturer to use pick-up trucks to count toward the US EPA 2007-2009 heavy-duty engine phase-in requirements.)

**Table 3**
Emission standards for chassis certified heavy-duty diesel vehicles, g/km
GVW	NMHC	CO	NOx	PM	HCHO
3860 - 4536 kg	0.121	4.5	0.1	0.01	0.02
4537 - 6350 kg	0.143	5.0	0.2	0.01	0.02