• Organization: U.S. Environmental Protection Agency
• Updated: 2021-02-15

Ground-level ozone is measured at CASTNET sites following the guidelines in 40 Code of Federal Regulations (CFR) Parts 50 and 58. Continuous measurements are averaged to hourly concentrations....

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• Organization: Department of the Interior
• Updated: 2020-08-26T00:00:00Z

Chemical data from 43,334 wells were used to examine the role of land surface-soil-aquifer connections in producing elevated manganese concentrations (>300 µg/L) in United States (U.S.)...

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• Organization: Department of Energy
• Updated: 2019-01-31T20:45:23Z

Rare earth element concentrations in the geothermal wells at the Puna geothermal field, Hawaii. Samples taken from geothermal wells KS-5, KS-6W, KS-9W, KS-14E, and KS-16N. Includes pH and...

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• Organization: Department of Energy
• Updated: 2019-01-31T20:45:37Z

* Requires permission of originators for use. Rare earth element concentrations in thermal springs from the wells at the Don A. Campbell geothermal plant, Nevada. Samples taken from geothermal...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2017-05-01

The dataset contains a list of cardiac and vascular biomarkers that were obtained on each day a participant visited the EPA Human Studies Facility. It also contains ozone concentrations on those...

• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2017-04-06T00:00:00.000+00:00

This dataset contains size-resolved mass concentrations of iron oxide aerosols and size-resolved number concentrations of iron oxide aerosols, measured using the modified single-particle soot...

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• Organization: Department of the Interior
• Updated: 2020-08-20T00:00:00Z

This release is for data on Zinc concentrations and isotopic signatures of an aquatic insect (mayfly, Baetis tricaudatus). Mayflies were exposed to an aqueous zinc concentration gradient in a...

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• Organization: Department of the Interior
• Updated: 2020-08-19T00:00:00Z

This dataset includes the bird species, sex, age, and total mercury concentrations in feathers, muscle, liver, and nail tissues.

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• Organization: U.S. Environmental Protection Agency
• Updated: 2024-02-20

Five years of data over a seven-year investigation at a PCB contaminated-sediment site to investigate if concentrations in spiders were consistently correlated with concentrations in sediment,...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2017-04-05

It is a compilation of organism concentrations of 16 sampling events conducted between July 2015 and February 2016. It also includes statistical analysis such as mean, standard deviation, etc. ...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2022-02-01

The file contains raw data measurement conducted by EPA's contractor. The data have the names of the samples and the concentration of 26 PFAS compounds that were analyzed. This dataset is...

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• Organization: Department of the Interior
• Updated: 2023-04-27T00:00:00Z

Chemical changes in hot springs, as recorded by thermal waters and their mineral deposits, provide a window into the evolution of Yellowstone’s postglacial hydrothermal system. Travertine...

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• Organization: Department of Energy
• Updated: 2019-01-31T20:45:02Z

Rare earth element concentrations in submarine hydrothermal fluids from Alarcon Rise, East Pacific Rise, REE concentrations in submarine hydrothermal fluids from Pescadero Basin, Gulf of...

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• Organization: National Aeronautics and Space Administration
• Updated: 2025-07-17

The Annual PM2.5 Concentrations for Countries and Urban Areas, 1998-2016, consists of mean concentrations of particulate matter (PM2.5) for countries and urban areas. The PM2.5 data are from the...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2016-05-26

We describe screening level estimates of potential aquatic toxicity posed by 227 chemical analytes that were measured in 25 ambient water samples collected as part of a joint USGS/USEPA drinking...

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• Organization: Department of the Interior
• Updated: 2020-08-21T00:00:00Z

This data set includes estimated chloride concentrations for the 93 USGS water quality monitoring stations located across the eastern United States. Chloride concentrations were predicted using...

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• Organization: National Institute of Standards and Technology
• Updated: 2024-02-19 00:00:00

Concentrations of plastic additive chemicals were taken from peer-reviewed literature. Only studies that mentioned the chemicals as plastic additives were included. Studies that measured plastic...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2016-08-17

This dataset contains simulated pathogen concentrations in locally-collected greywater and wastewater. Each .zip file includes 21 .csv files, each containing 10,000 years of simulated daily...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2021-05-08

This is a dataset for biogenic silica concentrations (%BSi by dry weight) from macroalgae from two temperate estuaries: Waquoit Bay (MA, USA) and Narragansett Bay (RI, USA). Additional data on %C,...

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• Organization: Department of the Interior
• Updated: 2020-08-20T00:00:00Z

Insect metamorphosis often results in substantial chemical changes that can fractionate isotopes and alter contaminant concentrations. We exposed larval mayflies (Baetis tricaudatus) to an aqueous...

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