Data and Tools

Frequent Questions

AQS Tips and FAQs used to resolve AQS issues

What do I do when I receive the error "Sample duration cannot change within a calendar year"?

When the need to change sample duration at a monitor arises a user should create a new POC with the new sample duration. By adding a new POC and this will allow for better understanding of what is going on at the site during any analysis. EPA utilizes the POC…

Last published: April 28, 2025

Cost Estimates of Studies Required for Pesticide Registration

EPA is making the database of test costs publicly available on the OPP's
Minor Use Pesticide Registration webpage.

UEV Library

The Unit Emergy Value (UEV) Library is a simple web-based tool for assessing resource use in elementary flows and storages.

More Information about the CyAN Project or the CyAN App

Contact information for the CyAN project.

AP 42, Fifth Edition, Volume I Chapter 7: Liquid Storage Tanks

GHGRP 2021: Supplier Highlights

Fuel and industrial GHG supplier highlights of 2021 emissions of greenhouse gases in EPA's Greenhouse Gas Reporting Program.

Tribal Green Building Code Guidance

Ordinance, Code Language and References guidance for Tribes using the Tribal Green Building Codes toolkit and resources.

AQUATOX 3.1 Fact Sheet

AQUATOX Release 3.1 includes numerous enhancements designed to improve model performance, more closely match data requirements with generally available data, improve data manipulation and analysis, and increase user friendliness.

Guidance for Email Transmittal of Air Permit Documents from Louisiana sources to R6AirPermitsLa@epa.gov

Provides email subject text and file naming conventions for people sending air permit related information to EPA Region 6 for sources located in Louisiana

AQUATOX Release 3.2 Fact Sheet

AQUATOX Release 3.2 was designed to extend the existing AQUATOX estuarine version to include improved capabilities for situations encountered in the nearshore marine environment. Several changes were required to model food webs in the marine environment.