Science Inventory

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The U.S. Environmental Protection Agency (EPA) is conducting a review of the air quality criteria and the primary (health-based) national ambient air quality standards (NAAQS) for nitrogen dioxide (NO2). The major phases of the process for reviewing NAAQS include the following: (...

The NOx Integrated Review Plan is the first document generated as part of the National Ambient Air Quality Standards (NAAQS) review process. The Plan presents background information, the schedule for the review, the process to be used in conducting the review, and the key policy...

The seasonal occurrence of deep-water hypoxia in western Long Island Sound (LIS) has been documented for decades by water quality cruise surveys and fixed mooring buoys. While previous studies have focused on factors modulating bottom dissolved oxygen (DO) at subtidal timescales,...

To assess the consequences of nutrient reduction strategies on water quality under climate change, we investigated the long-term dynamics of dissolved oxygen (DO) and pH in Narragansett Bay (NB), a warming urbanized estuary in Rhode Island, where nitrogen loads have declined due ...

Climate change and atmospheric deposition of nitrogen (N) and sulfur (S) impact the health and productivity of forests. Here, we explored the potential impacts of these environmental stressors on ecosystem services provided by future forests in the contiguous U.S. We found that a...

Effects of ambient decreases in N deposition on forest N cycling remain unclear as soils recover from acidic deposition. To investigate, repeated soil sampling data were related to deposition, vegetation, and stream data, for 2000&ndash;2015 in North and South Buck Creek watershe...

Terrestrial organisms and ecosystems are being exposed to new and rapidly changing combinations of solar UV radiation and other environmental factors because of ongoing changes in stratospheric ozone and climate. In this Quadrennial Assessment, we examine the interactive effects ...

Poly- and perfluoroalkyl substances (PFAS) are oxidatively recalcitrant organic synthetic compounds. PFAS are an exceptional group of chemicals that have significant physical characteristics due to the presence of electronegative fluorine. PFAS persists in the environment, bioacc...

A key part of the problem formulation phase of environmental assessment is the development of conceptual model diagrams. These diagrams, which explicitly illustrate hypothesized pathways between sources, stressors, and responses relevant to the focal issue, are used in scoping an...

EPA-ORD-CPHEA's Michael Pennino and Jana Compton were invited to present on groundwater nitrate at SSWR&rsquo;s Quarterly Research Area Coordination Team (RACT) meeting for the Nutrients topic SSWR.4 on June 5, &nbsp;2024.&nbsp; This meeting brings together the research coordinat...

Drinking water nitrate contamination is a significant economic and public health concern in The Great Plains, with few tested best practices for improving source water quality. This project seeks to establish a monitoring framework for quantifying the benefits of soil health prac...

Although the offshore water of Lake Michigan has been below the Great Lakes Water Quality Agreement (GLWQA) total phosphorus (TP) spring target concentration of 7 &micro;g L&minus;1&nbsp;for several decades, higher TP concentrations occur in the nearshore, contributing to the res...

Seasonal hypoxia, or low dissolved oxygen, in Long Island Sound (LIS) has declined since the early 2000s due to management actions that reduced point source nitrogen loading. To further quantify and better understand drivers of changes in the spatial and temporal distribution dis...

Nitrogen management in Long Island Sound (LIS) has reduced N loading and the extent of hypoxia over the last 2 decades. To support communication around successful remediation of hypoxia and the remaining challenges of N management, we are analyzing 30 years of water quality data ...

Onsite wastewater treatment systems are a major source of excess nutrients and co-pollutants in groundwater. The high density of septic systems in New England&rsquo;s coastal watersheds has degraded the quality of drinking and recreational freshwater resources and led to collapse...

Air pollution is a global environmental and public health issue. Exposure to air pollution is associated with elevated risk of morbidity and mortality from respiratory, cardiovascular, and neurological diseases. Following exposure to air pollution, the lung and other organ system...

Reduction of total phosphorus (TP) loads has long been a management focus of Chesapeake Bay restoration, but riverine monitoring stations have shown mixed temporal trends. To better understand the regional patterns and drivers of TP trends across the Bay watershed, we compiled an...

EPA-ORD-CPHEA's Michael Pennino and Jana Compton were invited to present on groundwater nitrate at the EPA Region 5 State Water Directors Meeting on May 15, 2024.&nbsp; This meeting brings together EPA Region 5 state clean water and drinking water directors to discuss topics of c...

Harmful cyanobacterial blooms are becoming more common and persistent around the world. When in bloom, various cyanobacterial strains can produce anatoxins in high concentrations, which, unlike other cyanobacterial toxins, may be present in clear water. Potential human and animal...

The integrated forest ecosystem model ForSAFE-Veg was used to simulate soil processes and understory vegetation composition at three&mdash;sugar maple, beech, yellow birch&mdash;hardwood forest sites in the Northeastern United States (one at Hubbard Brook, NH, and two at Bear Bro...

This is a presentation to the Water Treatment Interagency Working Group and is a summary of EPA/ORDs water sensor research effort, focusing on drinking water applications.&nbsp;

Water quality standards are important for protecting and restoring the condition of lakes, rivers, estuaries, and other water bodies in the United States. Given that nutrient pollution continues to be a widespread problem in aquatic systems, the development of numeric nutrient cr...

Excess nutrients (nitrogen and phosphorus) in lakes can lead to eutrophication, hypoxia, and algal blooms that may harm aquatic life and people.&nbsp;&nbsp;Some U.S. states have established numeric water quality criteria for nutrients to protect surface waters.&nbsp;&nbsp;However...

The content covers the validation of the NASA TEMPO mission with direct sun and multi-axis retrievals of NO2 and formaldehyde trace gas vertical column products from the Pandonia Global Network. The slides present nuances in the strengths and weakness of Pandonia Global Network d...

In July 2023, the US Environmental Protection Agency (EPA) hosted a workshop bringing together experts to discuss air sensor quality assurance (QA). This workshop focused on particulate matter (PM) sensors, fenceline and near-source community volatile organic compound (VOC) senso...