Science Inventory

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Critical loads or levels (CL) are estimates of quantitative thresholds for levels of deposition above which significant harmful ecological effects can occur, according to present knowledge.&bull; Recent research focused on establishing CLs for tree species&rsquo; growth and survi...

Climate change presents cascading and compounding threats to low-income and underrepresented communities, increasing the need for equitable resilience planning. However, many local governments face challenges incorporating community voices with resilience and vulnerability data i...

Increasing and inequitable impacts from climate change and other hazards are a growing concern for communities and a focus of planning efforts. This research, conducted through case studies with several U.S. communities, explores and develops ways to center equity in resilience p...

Assessing the fate of PFAS in the environment requires improved analytical methodologies to quantify a greater variety of PFAS and application of these methods to investigate their occurrence in complex sample matrices. PFAS precursors are a compound class of emerging concern tha...

This presentation shares an overview of the research that ORD is planning to co-produce with the Crisfield, Maryland community and stakeholders to investigate options for nature-based solutions for coastal resilience. It presents preliminary research results from scoping potentia...

Conventional mining-influenced (MIW) treatment facilities are expensive to operate and maintain, partly because they produce large quantities of metals-containing sludge that must be managed for years or decades, and in some cases in perpetuity. In 2020, EPA&rsquo;s Office of Sup...

Poster presentation to the&nbsp;PFAS Research Workshop &quot;Science for a Changing World&quot;, hosted by Office of Research and Development (ORD) Office of the Science Advisor, Policy, and Engagement (OSAPE) and Center for Environmental Solutions and Emergency Response (CESER) ...

This is a broad overview presentation covering CEMM's ambient and near-source air measurement research for an international audience. The presentation includes content related to Federal Reference Methods (FRMs) and Federal Equivalent Methods (FEMs) for the NAAQS, air sensor tech...

With the declining tailpipe emissions from the US and worldwide motor vehicle fleet, impacts of tire and brake wear are an increasingly important area of interest.&nbsp; Recent research has shown the compound 6PPD used in tires as an anti-degradation chemical reacts with ozone to...

Anthropogenic disturbances have increased the frequency, area, and intensity of eutrophic events in coastal ecosystems, harming seagrass and macrofauna. The Pawcatuck River and Little Narragansett Bay (CT/RI) is a small, shallow estuary with zones of hypoxia due to algal growth. ...

Seagrass meadows and oyster beds are important coastal systems that provide many benefits. When these habitats are located near each other, benefits may include improved water quality and increased carbon storage. In two RI salt ponds, habitat zones sampled included eelgrass beds...

Seagrass beds provide key benefits, including playing a critical role in climate mitigation. We tested the effects of different eelgrass densities on greenhouse gas (GHG) fluxes at the water-atmosphere interface by creating six treatments (4 reps ea) with different shoot densitie...

Per- and polyfluoroalkyl substances (PFAS) are increasingly at the forefront of environmental concern. Despite their frequent detection in environmental media, the highly persistent nature of many PFAS, and growing evidence demonstrating adverse health effects in a variety of spe...

This presentation summarizes perspectives from the U.S. Environmental Protection Agency&rsquo;s 2023 Air Sensors Quality Assurance Workshop (https://www.epa.gov/air-sensor-toolbox/quality-assurance-air-sensors#QAworkshop). Air sensors can provide valuable non-regulatory and suppl...

Presentation presented to the 1st International Electronic Conference on Toxics (IECTO)Session E. Novel Methods in Toxicology Research

Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that have been in use since the 1940s in a wide array of consumer products. PFAS are persistent in the environment and bioaccumulate. Thermal treatment methods are currently applied to a variety of mater...

Toxicological outcomes in vivo result from complex interactions among molecular,&nbsp;cellular and tissue-level damage responses which are difficult to recapitulate in vitro or&nbsp;extrapolate from data-based Machine Learning or molecular-level computer simulations.&nbsp;Mechani...

This is a lecture to the Colorado Produced Water Consortium to review methods that are used by EPA to evaluate chemicals and mixtures.

Hepatic steatosis (fatty liver disease) is a pathological condition that may alter xenobiotic metabolism, thereby increasing susceptibility to environmental toxicants. Here we used a metabolically competent human liver-derived cell line &ndash; HepaRG &ndash; to model steatosis f...

This sub-product provides an overview on our work with novel technologies to separate and destroy PFAS in residual waste streams (e.g., incinerator scrubber water, reverse osmosis retentate). This presentation focuses on a stepwise process where adsorbents first separate PFAS and...

The purpose of this work is to provide data and information to refine existing guidance about how to flush per- and polyfluoroalkyl substances (PFAS) from firefighting systems, specifically hangar systems and Aircraft Rescue and Firefighting (ARFF) vehicles. It is relevant to the...

Radioactive fallout could have debilitating effects on drinking water and wastewater systems. At least some drinking water system operators have plans to mitigate the effects of a contaminated water source, but most, if not all, wastewater operators have no such plans.&nbsp; Both...

Legionella pneumophila (Lp) is an opportunistic drinking water pathogen that can cause infections through the inhalation of Lp-containing aerosols. Lp can occur in premise plumbing systems as these systems often have low disinfection residual, high surface area-to-volume ratios, ...

The threat of cascading and compounding disasters in low-income and underrepresented communities with hazardous and polluting sites makes urgent the need to build resilience. The Equitable Resilience Builder (ERB) is a new tool designed for situations where capacity and resources...

This presentation covers updates as of March 2024 regarding EPA methods for per- and polyfluoroalkyl substances (PFAS) as well as ongoing method development work within EPA Office of Research and Development (ORD). EPA Methods 1633 and 1621 were finalized on January 31, 2024. Fut...