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Speciated volatile and semi-volatile organic compound emissions (VOCs and SVOCs, resp.), including mobile source air toxics (MSATs), were characterized in vehicle exhaust from three modern gasoline direct injection (GDI) light-duty vehicles. The test vehicles were in the U.S. EPA...

A multi-agency, collaborative effort was completed in the fall of 2016 and summer of 2017 to provide a baseline assessment of pre-remedial conditions. Multiple state and federal agencies (U.S. Army Corps of Engineers (USACE), U.S. EPA ORD, U.S. EPA GLNPO, USGS and Minnesota Pollu...

Peat and eucalyptus smoke produces equivalent toxicity between flaming and· smoldering conditions despite tenfold lower PM concentrations for flaming Smoke from oak combustion is less toxic than that from peat or eucalyptus Smoke inhalation has significant eff...

Excess nitrogen (N) and phosphorus (P) from human activities have contributed to degradation of coastal waters globally. A growing body of work suggests that hydrologically restoring streams and rivers in agricultural and urban watersheds has potential to increase N and P retenti...

Imaging-based phenotypic profiling is a screening method that combines automated microscopy and image analysis to measure a large variety of features at the single cell level. Here, we describe how we adapted an existing assay that evaluates changes in organelle morphology (Bray ...

We have used historical time series data for flow on the Ohio River and developed a theoretically rational means of characterizing the unique hydrologic conditions that coincided with the record-setting HAB in 2015. Two statistical techniques were used to derive significant model...

Past programs in EPA for technology evaluation included:SITE (ended early 2000’s, was line-item in Budget) ETV (ended 2010) Interaction between Federal and private industry with commercially available or ‘viable’ (i.e., SBIR) products or processes For the future...

Objectives. A wide array of military munition constituents are present in water bodies surrounding historically deposited unexploded ordnance. A common approach for monitoring explosive constituents involves the collection of large quantities of discrete water samples combined wi...

Bayesian networks provide powerful and flexible modeling platforms for examining uncertainty and making inferences. They are especially useful for developing models that reflect causal issues such as how a stressor might impact an environmental endpoint of concern or how a decisi...

This presentation provides an overview of research on air quality model evaluation being performed at USEPA. The overview is structured according to the model evaluation framework proposed by Dennis et al. (2010). Examples are provided for advances in operational evaluation, diag...

Presentation comparing health advisories and possible health effects of harmful algal blooms (HABS)

Hurricane Katrina resulted in damage and destruction to local water supplies in Mississippi and Louisiana affecting millions of people. Immediately following the devastation, a multidisciplinary team of 30 EPA emergency response, research, and water program personnel joined forc...

This presentation will discuss an introduction to dose-response to include the four steps within the risk assessment process.

This submission is a slide presentation that has already been formerly cleared and presented at the National ACS spring meeting in Boston, MA 2018 (ORD-025841) and the Ground Water Professionals of North Carolina annual meeting in November 2018 (ORD-029090). Changes have been mad...

Prior to the Exxon Valdez oil spill (EVOS), ecological impacts were generally thought to be short-term and controlled by the mono-aromatic and less persistent components of oil. The long term ecological impacts of EVOS were compared to two other extensively studied and more recen...

Ammonia (NH3) is the most abundant alkaline component in the atmosphere, is therefore of great importance in the neutralization of atmospheric acids and formation of aerosol particles. Numerous studies have been published investigating the effects of NH3 fluxes on agricultural ec...

Although there is no direct connection between Extreme Weather Events and corrosion issues in drinking water distribution systems, there are situations that may arise that would result in corrosion events that could impact human health. One would be a large change in source wate...

Using a Climate Resilience Screening Index (CRSI) that was developed to represent resilience to acute weather events at multiple scales for the United States, regions of the United States are compared for resilience. The comparison examined the domains and indicators of CRSI add...

Objectives. Freely dissolved concentrations (Cfree) have proven useful for estimating exposure concentrations of nonionic organic contaminants in the water column and sediment interstitial waters. It is critical that Cfree be determined under actual or modelled equilibrium cond...

When it comes to wildlife, populations are often the level at which protection goals are established, as opposed to individuals. However, direct observations of population-level responses to chemical stressors are scarce (thankfully). Therefore, mathematical models are used to ...

Several national diatom datasets from EPA and USGS will be synthesized to develop multi-metric indices of biological condition along urban and agricultural gradients. Diatom traits tables will be used to develop the multi-metric indices, including traits such as saprobity, pollut...

CMAQ is a comprehensive atmospheric modeling system. This invited presentation overviews the development history and recent enhancements to the modeling system in context of its use for the following emerging air pollution issues: (1)Examination of U.S. air pollution in context o...

This presentation provides an update to ongoing collaborations with Inter American University of Puerto Rico. The goal of these studies is to investigate public health benefits that result from implementation of low cost, sustainable filtration technologies in remote, rural commu...

Increased availability of commercially-available low cost air quality sensors combined with increased interest in their use by citizen scientists, community groups, and professionals has resulted in a flood of journal articles summarizing their use. Even so, the US EPA's SPEAR r...

Background/Objectives. In the past decade, passive sampling methods have undergone extensive development and the technique is now being applied at many Superfund sites to measure concentrations of freely dissolved chemical in the water column and sediment pore waters. If ecologic...