Science & Technology

State Implementation Plan (SIP) Attainment Demonstration Guidance

how to prepare attainment demonstrations for National Ambient Air Quality Standards (NAAQS) and the Regional Haze Rule using air quality modeling and other relevant technical analyses.

Multipollutant Modeling Applications

2002 multi-pollutant modeling platform

Photochemical Modeling Applications

Provides access to modeling applications involving photochemical models, including modeling of ozone, particulate matter (PM), and mercury for national and regional EPA regulations such as the Clean Air Interstate Rule (CAIR) and the Clean Air Mercury Rule

Air Quality Models - Clarification Memos for Dispersion Models

Memoranda issued by EPA as general clarifications for issues related to Appendix W and technical aspects of dispersion models, when necessary.

Air Modeling - Meteorological Guidance

Meteorological guidance for the use of observational data in permit modeling, monitoring for modeling applications, and other related data procedures and quality assurance

AERMOD Modeling System Development

AERMOD Model System development plans and ongoing research, which is summarized in a series of White Papers.

Nitrogen Dioxide/Nitrogen Oxide In-Stack Ratio (ISR) Database

The EPA’s Guideline on Air Quality Models, Appendix W to 40 CFR Part 51, recommends a three-tiered screening approach to estimate ambient concentrations of Nitrogen Dioxide (NO2).

Air Modeling - Observational Meteorological Data

Observed meteorological data for use in air quality modeling consist of physical parameters that are measured directly by instrumentation, and include temperature, dew point, wind direction, wind speed, cloud cover, cloud layer(s), ceiling height,

Air Quality Model Clearinghouse

The Model Clearinghouse is a focal point for interpretation of modeling guidance in specific regulatory applications.

Chemical Mass Balance (CMB) Model

The EPA-CMB Version 8.2 uses source profiles and speciated ambient data to quantify source contributions. Contributions are quantified from chemically distinct source-types rather than from individual emitters.

Download COBRA

Download the COBRA (Co-Benefits Risk Assessment) screening tool to explore the health and economic benefits of policies that affect air pollution.

P2 Case Study, How One Facility Completely Eliminated the Use of TCE. Schick Razor Blade Manufacturing in Knoxville, Tennessee

P2 Case Study. How One Facility Completely Eliminated the Use of TCE. Schick Razor Blade Manufacturing in Knoxville, Tennessee.

State and Association Websites with Air Test Method and Monitoring Information

Government and association websites that include methods and testing information.

The Basics of Water Remediation

This web-page that describes the high-level fundamentals of the Characterization, Decontamination, and Clearance.

EPA ExpoBox and Exposure Factors

This page explains how Exposure factors are a vital resource on the EPA ExpoBox site and how it can be used. Links to the EFH by chapter, latest chapter updates and a searchable data tables database.

Everglades Ecosystem Assessment: Water Management and Quality, Eutrophication, Mercury Contamination, Soils and Habitat - EPA 904-R-07-001, August 2007

This report summarizes the results for the Program and 2005 Phase III biogeochemical sampling. This survey documented ecological condition for the 2,063-square-mile freshwater portion of the Everglades Protection Area.