Science & Technology
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Incremental Evaluation of CMAQv5.2
The impact on model predicted pollutant concentrations of the major changes in the CMAQv5.2 system compared to the last are tested one at a time. Evaluation results are summarized for ozone and PM2.5 based on simulations of January and July 2011.
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Understanding Gulf of America Hypoxia Using CMAQ
The coupled EPIC/CMAQ modeling system simulated impacts on air and land quality of different land use changes driven by potential energy and agricultural management decisions. Linking these results to watershed models allows for analysis of hypoxia events.
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Browse CMAQ Applications
The CMAQ system has been used to address major environmental issues. Below are examples of how the CMAQ system provides information to help communities, states and countries determine the most effective strategies for reducing exposure to pollution.
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Chesapeake Bay - CMAQ
Atmospheric deposition is a significant contributor to the total nitrogen loading to Chesapeake Bay. The CMAQ modeling system provides important information on the amount of atmospheric deposition for use in Total Maximum Daily Load analyses for different
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Estimating Watershed Acidification using CMAQ
The Variable Infiltration Capacity (VIC) model was linked to WRF-CMAQ to provide hydrological information needed by the Model of Acidification of Groundwater In Catchment (MAGIC) to study stream water chemistry response to air quality regulations.
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Estimating Atmospheric Deposition with CMAQ
Atmospheric deposition can be an important contribution to the total loading of nitrogen and sulfur to ecosystems. CMAQ model estimates can be fused with measured air concentration and wet deposition to reduce bias and develop grids and maps of total depo
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Climate Change Indicators: Marine Heat Waves
This indicator measures trends in mountain snowpack in the western United States.
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Design for the Environment Alternatives Assessments
EPA's Design for the Environment conducts alternatives assessments to explore functional alternatives to priority chemicals
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Non-Targeted Analysis Research
Page describing Non-Targeted analysis research and how it can be used to find previously unknown chemicals in a sample.
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Related Links
links to ongoing research within EPA
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Basics of Green Chemistry
Green chemistry the design of chemical products and processes that reduce or eliminate the use or generation of hazardous substances. This page gives a basic introduction.
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Exceptional Events Documents Particulate Matter - Nevada County, CA
Exceptional Events Documents Ozone - San Joaquin Valley, CA
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Example Demonstrations and EPA Responses Prepared under the 2016 Exceptional Events Rule
This table contains examples of air agency submitted exceptional events demonstrations and responsive EPA decision documents that have been prepared and/or acted upon under the 2016 Exceptional Events Rule
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Updated Exceptional Events Rule FAQs
This document replaces the “Interim Exceptional Events Rule Frequently Asked Questions” document posted on May 14, 2013. This version also contains a newly inserted Question B.16. that was not included in the previously posted July 9, 2018 version.
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Informational Public Webinar on New Exceptional Events Implementation Tools
This page contains links to newly developed, draft exceptional events implementation tools and documents.
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AQS User Support
AQS User Support
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National Coastal Condition Assessment
It is important to monitor coastal waters for potentially harmful trends and to identify areas in good condition. That is the purpose of the National Coastal Condition Assessment, which EPA conducts every few years.
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Celebrate Black History Month with EPA
February is Black History Month. EPA recognizes Black scientists and engineers who devote their careers to help the Agency meet its mission to protect human health and the environment.
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Tiny Plastics, Big Threat: How are Microplastics Impacting our Coral Reefs?
Coral reefs worldwide are under threat from natural and human-made stressors including dredging, climate change, and plastic pollution. At EPA’s Coral Research Facility – an indoor wet lab in Gulf Breeze, Florida – scientists are studying them.
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Understanding the Impacts of Synthetic Nitrogen on Air and Water Quality Using Integrated Models
What does corn have to do with air pollution? Many of us don’t often consider how the food we eat - and the chemicals used to grow, package, or prepare it – can impact the air we breathe and the water we drink.