EPA Tier 4
E202242
EPA Tier 4 is a stringent U.S. Environmental Protection Agency emissions standard for non-road and locomotive diesel engines that sharply limits pollutants such as nitrogen oxides and particulate matter.
All labels observed (3)
| Label | Occurrences |
|---|---|
| EPA Tier 4 canonical | 6 |
| EPA Tier 3 | 1 |
| EPA Tier 4 emission standards | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1791960 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: EPA Tier 4 Context triple: [Siemens Charger, emissionsStandard, EPA Tier 4]
-
A.
Clean Trucks Program
The Clean Trucks Program is an environmental initiative at the Port of Long Beach that aims to reduce air pollution and greenhouse gas emissions by requiring cleaner, lower-emission trucks for port operations.
-
B.
Duramax V8 diesel
The Duramax V8 diesel is a family of turbocharged diesel engines co-developed by General Motors and Isuzu, widely used in heavy-duty Chevrolet and GMC trucks for their strong torque, towing capability, and durability.
-
C.
ECU
ECU is the three-letter ISO 3166-1 alpha-3 country code that uniquely identifies Ecuador in international standards and data systems.
-
D.
T1 HD truck platform
The T1 HD truck platform is General Motors’ heavy-duty full-size pickup architecture underpinning the latest Chevrolet Silverado HD and GMC Sierra HD models, designed for high towing capacity and commercial-grade durability.
-
E.
PACCAR
PACCAR is a major American manufacturer of commercial trucks and related heavy-duty vehicles headquartered in Bellevue, Washington.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: EPA Tier 4 Target entity description: EPA Tier 4 is a stringent U.S. Environmental Protection Agency emissions standard for non-road and locomotive diesel engines that sharply limits pollutants such as nitrogen oxides and particulate matter.
-
A.
Clean Trucks Program
The Clean Trucks Program is an environmental initiative at the Port of Long Beach that aims to reduce air pollution and greenhouse gas emissions by requiring cleaner, lower-emission trucks for port operations.
-
B.
Duramax V8 diesel
The Duramax V8 diesel is a family of turbocharged diesel engines co-developed by General Motors and Isuzu, widely used in heavy-duty Chevrolet and GMC trucks for their strong torque, towing capability, and durability.
-
C.
ECU
ECU is the three-letter ISO 3166-1 alpha-3 country code that uniquely identifies Ecuador in international standards and data systems.
-
D.
T1 HD truck platform
The T1 HD truck platform is General Motors’ heavy-duty full-size pickup architecture underpinning the latest Chevrolet Silverado HD and GMC Sierra HD models, designed for high towing capacity and commercial-grade durability.
-
E.
PACCAR
PACCAR is a major American manufacturer of commercial trucks and related heavy-duty vehicles headquartered in Bellevue, Washington.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
United States environmental regulation
ⓘ
emissions standard ⓘ |
| appliesTo |
locomotive diesel engines
ⓘ
newly manufactured engines ⓘ non-road diesel engines ⓘ |
| classification | Tiered emission standard ⓘ |
| comparedTo | stricter than EPA Tier 3 ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| documentType | federal regulation ⓘ |
| doesNotApplyTo | most existing in-use engines ⓘ |
| effectivePeriodStart |
around 2008 for some nonroad categories
ⓘ
around 2015 for most new locomotives ⓘ |
| enforcedBy | United States Environmental Protection Agency ⓘ |
| environmentalImpact |
significant reduction in smog-forming emissions
ⓘ
significant reduction in soot emissions ⓘ |
| follows |
EPA Tier 3
ⓘ
linked to:
EPA Tier 4
|
| goal |
improvement of air quality
ⓘ
reduction of diesel engine emissions ⓘ reduction of public health impacts from air pollution ⓘ |
| healthImpact |
reduced exposure to fine particulate matter
ⓘ
reduced risk of respiratory diseases ⓘ |
| imposesLimitOn |
grams per brake horsepower-hour of nitrogen oxides
ⓘ
grams per brake horsepower-hour of particulate matter ⓘ |
| jurisdiction | federal ⓘ |
| legalBasis | Clean Air Act ⓘ |
| partOf |
EPA locomotive emission standards
ⓘ
EPA nonroad diesel engine emission standards ⓘ |
| precedes | EPA Tier 5 (proposed or conceptual) emission standards ⓘ |
| regulatesPollutant |
carbon monoxide
ⓘ
hydrocarbons ⓘ nitrogen oxides ⓘ particulate matter ⓘ |
| regulatingAuthority | United States Environmental Protection Agency ⓘ |
| relatedTo | California Air Resources Board off-road diesel regulations ⓘ |
| requires |
certification of engines to Tier 4 limits
ⓘ
engine manufacturers to redesign combustion systems ⓘ |
| requiresTechnology |
advanced exhaust aftertreatment
ⓘ
diesel particulate filters ⓘ selective catalytic reduction ⓘ ultra-low sulfur diesel fuel ⓘ |
| scope |
agricultural equipment
ⓘ
construction equipment ⓘ freight locomotives ⓘ industrial equipment ⓘ passenger locomotives ⓘ |
| sector |
nonroad mobile sources
ⓘ
rail transportation ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: EPA Tier 4 Description of subject: EPA Tier 4 is a stringent U.S. Environmental Protection Agency emissions standard for non-road and locomotive diesel engines that sharply limits pollutants such as nitrogen oxides and particulate matter.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: EPA Tier 4
subject linked to:
EPA Tier 5 (proposed or conceptual) emission standards
linked to: EPA Tier 4