Science & Technology
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SmartWay Designated Tractors and Trailers
This page provides information about SmartWay designated tractors and trailers and how to become one.
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SmartWay Technology
This page provides information on SmartWay technology for locomotives, trucks, and school buses.
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Clean Diesel Technologies, Inc. – Purifilter EGR Diesel Particulate Filter (DPF)
This retrofit technology is included on EPA's Verified Technologies List for Clean Diesel.
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Johnson Matthey Technology—CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter
This retrofit technology is included on EPA's Verified Technologies List for Clean Diesel.
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Heavy-Duty Diesel Fuel Analysis
EPA's heavy-duty diesel fuel analysis program sought to quantify the hydrocarbon, NOx, and PM emission effects of diesel fuel parameters (such as cetane number, aromatics content, and fuel density) on various nonroad and highway heavy-duty diesel engines.
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2014 National Emission Inventory (NEI) Report
Analysis of the NEI and comparison to previous years of inventory data.
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About the Clean Air Technology Center
The Clean Air Technology Center provides resources for emerging and existing air pollution prevention and control technologies and provides public access to data and information on their use, effectiveness and cost.
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Green Book Early Action Compact (EAC) Areas
Early Action Compact (EAC) Areas
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Green Book Lead (1978) Area Information
Lead (1978)
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Green Book Sulfur Dioxide (1971) Area Information
Sulfur Dioxide (1971)
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Green Book 8-Hour Ozone (1997) Area Information - NAAQS Revoked
8-Hour Ozone (1997)
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Green Book PM-2.5 (1997) Area Information
PM-2.5 (1997)
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Green Book GIS Download
Green Book GIS Downloads
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New Paradigm for Air Pollution Monitoring: 2014-2018 Progress Report
EPA and partners have been involved in emerging air quality sensor research including a wide range of activities. This presentation's goal is to share research highlights from 2014-2018.
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Green Book PM-2.5 (2006) Area Information
PM-2.5 (2006)
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Green Book Map Download
Download Green Book Maps
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Alternative Means of Emission Limitation for Flares
This page consolidates EPA action on AMEL requests.
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Green Book 1-Hour Ozone (1979) Area Information - NAAQS Revoked
1-Hour Ozone Areas (1979)
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Green Book Lead (2008) Area Information
Lead (2008)
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Green Book Sulfur Dioxide (2010) Area Information
Sulfur Dioxide (2010)