Science & Technology
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GHGRP 2021: Petroleum and Natural Gas Systems: Onshore Production
Overview and data highlights of 2020 petroleum and natural gas systems emissions of greenhouse gases in EPA's Greenhouse Gas Reporting Program in the onshore production industry segment.
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GHGRP 2021: Suppliers of Natural Gas and Natural Gas Liquids
Overview and data highlights of 2021 natural gas and natural gas liquids sector emissions of greenhouse gases in EPA's Greenhouse Gas Reporting Program.
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GHGRP 2021: Suppliers of Petroleum Products
Overview and data highlights of 2021 natural gas and natural gas liquids sector emissions of greenhouse gases in EPA's Greenhouse Gas Reporting Program.
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GHGRP 2021: Petroleum and Natural Gas Systems: Other Industry Segments
Overview and data highlights of 2021 petroleum and natural gas systems emissions of greenhouse gases in EPA's Greenhouse Gas Reporting Program for other industry segments besides onshore production.
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GHGRP 2021: Non-Fluorinated Chemicals
Overview and data highlights of 2021 non-fluorinated chemical manufacturing emissions of greenhouse gases in EPA's Greenhouse Gas Reporting Program.
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GHGRP 2021: Emissions Ranges
Data from greenhouse gas-emitting facilities and suppliers in 2021 to the EPA greenhouse gas reporting program, as well as data highlights from the reporting year.
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GHGRP 2021: Metals
Overview and data highlights of 2021 metals sector emissions of greenhouse gases in EPA's Greenhouse Gas Reporting Program.
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GHGRP 2021: Waste
Overview and data highlights of 2021 waste sector emissions of greenhouse gases in EPA's Greenhouse Gas Reporting Program.
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An Approach for Using Load Duration Curves in the Development of TMDLs
This document shows how duration curves can be used for developing TMDLs and includes one case study.
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PCB TMDL Handbook
The documents provides regions, states and other stakeholders with a compendium of information for use in developing TMDLs for waterbodies impaired by polychlorinated biphenyls (PCBs).
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TMDL Effectiveness Monitoring Data and Plans
A series of guides for TMDL effectiveness monitoring data and plans.
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Establishing Total Maximum Daily Load (TMDL) Wasteload Allocations (WLAs) for Storm Water Sources and NPDES Permit Requirements Based on Those WLAs
The memoranda clarify existing EPA regulatory requirements for, and provide guidance on, establishing wasteload allocations (WLAs) for storm water discharges in total maximum daily loads (TMDLs) approved or established by EPA.
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EPA Geospatial Metadata Style Guide using EME 5 and EME for Pro
This Style Guide provides recommendations and instructions for using EPA Metadata Editor Version 5 to create geospatial metadata conforming to numerous federal standards.
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2023 National Emissions Inventory (NEI) Technical Support Document (TSD)
Explains the sources of information in the inventory; show what sources of data used for each sector; and provide more information about the components.
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EPA-Approved Mojave Desert Air Quality Management District (AQMD) Regulations in the California SIP
Documents and tables containing EPA approved and compiled rules and regulations for the Mojave Desert Air Quality Management District (AQMD) portion of the California State Implementation Plan (SIP).
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Peer Review for Evaluating HHCB, phthalic anhydride, o-DCB, and p-DCB
Information about the EPA's Peer Review of the risk evaluation for octamethylcyclotetrasiloxane (D4) under the Toxic Substances Control Act.
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Lake Pontchartrain Basin Restoration Program
Lake Pontchartrain Basin Restoration Program Web Area
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Missoula Railyard Reduces Costs and Idling Emissions
This web page provides an overview of technology changes (installation of APUs on locomotives), and operational changes (establishing an idling policy) that resulted in significant reduction of air emissions and reduced costs.
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About EPA's Science Advisory Organizations
List of internal and external science advisory organizations
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Collection of Methods
Find the links to multiple approved environmental measurement methods, from both inside and outside the Agency. These links are organized by area of research.