Science & Technology
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Trends Procedural Documentation
Description of procedures that EPA uses to summarizes and publish emission trends annually.
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Air Pollutant Emissions Trends Data
Annual tier 1 NEI summaries for criteria air pollutants (CAPs).
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Benefits of a Green Street
This webpage is designed to provide details on the benefits provided with a green street
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Fuel Economy and Environment Label Examples
See fuel economy and environment label examples for gasoline, electric and plug-in hybrid electric vehicles.
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Requirements for SmartWay Verification of Idling Reduction Technologies (IRTs) for Trucks
Before applying for SmartWay verification of your IRT, there are some important considerations and requirements to review.
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Technology-Specific Information for SmartWay Verification of Idling Reduction Technologies (IRTs) for Trucks
Providing technology-specific information is the third part in the five-step process for SmartWay verification of IRTs for Trucks.
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Overview of the SmartWay Verification Process for Idling Reduction Technologies (IRTs) for Locomotives
EPA's SmartWay Verification Program evaluates the ability of IRTs to decrease main engine idling in locomotives in order to save fuel and reduce emissions.
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Requirements for SmartWay Verification of Idling Reduction Technologies (IRTs) for Locomotives
Before applying for SmartWay verification of your IRT, there are some important considerations and requirements to review.
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Technology-Specific Information for SmartWay Verification of Idling Reduction Technologies (IRTs) for Locomotives
Providing technology-specific information is the third part in the five-step process for SmartWay verification of IRTs for Locomotives.
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List of Idling Reduction Technologies (IRTs) that are Eligible for the Federal Excise Tax Exemption
This list shows products that are currently eligible for Federal Excise Tax Exemption.
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List of Idling Reduction Technologies (IRTs) that are No Longer Eligible for the Federal Excise Tax Exemption
This list shows products that are NO LONGER eligible for Federal Excise Tax Exemption.
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SmartWay Verified List of Idling Reduction Technologies (IRTs) for Trucks and School Buses
This list shows SmartWay Verified IRTs for trucks, school buses, and locomotives.
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Formerly SmartWay Verified List of Idling Reduction Technologies (IRTs) for Trucks
This list shows IRTs that are NO LONGER SmartWay Verified.
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Learn About Idling Reduction for Locomotives
This page provides information about reducing idling for locomotives.
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Learn about Verified Technologies for Clean Diesel
Learn about diesel retrofit technologies that EPA has approved or conditionally approved for use in engine retrofit programs.
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Learn About Idling Reduction Technologies (IRTs) for Trucks and School Buses
This page provides information about SmartWay Verified idling reduction technologies (IRTs) for trucks.
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Learn About Federal Excise Tax Exemption
This list shows products that are currently eligible for Federal Excise Tax Exemption.
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Evaluation for SmartWay Verification of Idling Reduction Technologies (IRTs) for Trucks
The evaluation process is the fourth and final part of the SmartWay verification process for Idle Reduction Technologies (IRTs) for Trucks.
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Confirmatory Testing for Engines and Vehicles
The steps for confirmatory testing for small spark-ignition (SI) and compression-ignition (CI) engines at EPA's National Vehicle and Fuel Emissions Laboratory (NVFEL).
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Light-duty Models for Greenhouse Gas (GHG) Emissions
This page links to models and modeling systems related to GHG emissions.