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    Federal
Air Quality Measures on the National Environmental Health Tracking Network
U.S. Department of Health & Human Services —
The Environmental Protection Agency (EPA) provides air pollution data about ozone and particulate matter (PM2.5) to CDC for the Tracking Network. The EPA maintains a... - 
  
    Federal
Clean Air Status and Trends Network (CASTNET) Download Data Module
U.S. Environmental Protection Agency —
The CASTNET Download Data module allows users to select, view, and download CASTNET data (Raw, Aggregate, Modeled & Factual Data) based on user selections.... - 
  
    Federal
1987-2018 cyanobacteria and water quality data for 20 reservoirs
U.S. Environmental Protection Agency —
These data include cyanobacteria cell densities (including maximum cell densities observed for each year in each reservoir), annual summer (June-August)... - 
  
    Federal
Clean Air Status and Trends Network (CASTNET): Ozone
U.S. Environmental Protection Agency —
8-hour daily maximum ozone concentrations as measured by the Clean Air Status and Trends Network (CASTNET) - 
  
    Federal
NIST Atomic Spectra Database - SRD 78
National Institute of Standards and Technology —
This database provides access and search capability for NIST critically evaluated data on atomic energy levels, wavelengths, and transition probabilities that are... - 
  
    Federal
"Deepwater CTD - 03252336.ctd.nc - 29.04N, -87.97W - 1977-07-20"
National Oceanic and Atmospheric Administration, Department of Commerce —
The Minerals Management Service (MMS) of the U. S. Department of the Interior funded the Deepwater Physical Oceanography Reanalysis and Synthesis of Historical Data... - 
  
    Federal
Dissolved inorganic carbon (DIC), total alkalinity and other hydrographic and chemical variables collected from discrete samples and profile observations during NOAA Ship Ronald H. Brown cruise RB1504 (EXPOCODE 33RO20150713) in the the Gulf of Alaska from 2015-07-13 to 2015-07-31 (NCEI Accession 0201748)
National Oceanic and Atmospheric Administration, Department of Commerce —
This dataset includes discrete profile measurements of dissolved inorganic carbon (DIC), total alkalinity, temperature, salinity, oxygen and nutrients measured during... - 
  
    Federal
National Geochemical Database on Ore Deposits: Legacy data
Department of the Interior —
There is a growing demand for commodities (elements, compounds, minerals) used in today's advanced technologies. Critical minerals are usually found in ore deposits... - 
  
    Federal
Hawaii Clean Water Branch (CWB) Beach Water Quality Data
National Oceanic and Atmospheric Administration, Department of Commerce —
Exposure to sewage contaminated recreational waters may cause gastrointestinal illnesses in swimmers. The State of Hawaii Department of Health (HIDOH) Clean Water... - 
  
    Federal
NIST Atomic Spectra Database - SRD 78
Department of Commerce —
This database provides access and search capability for NIST critically evaluated data on atomic energy levels, wavelengths, and transition probabilities that are... - 
  
    Federal
Dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, temperature, salinity, oxygen, nutrients and other measurements collected from profile and discrete sample observations during the R/V Keifu Maru II cruise KS12-01 (EXPOCODE 49UF20120108) in the North Pacific Ocean from 2012-01-08 to 2012-01-26 (NCEI Accession 0186234)
National Oceanic and Atmospheric Administration, Department of Commerce —
This dataset includes discrete profile measurements of dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, temperature, salinity, oxygen and... - 
  
    Federal
NIST Atomic Energy Levels and Spectra Bibliographic Database
Department of Commerce —
References contained in this database are from Bibliography on Atomic Energy Levels and Spectra, NBS Special Publication 363 and Supplements, as well as current... - 
  
    Federal
Dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, temperature, salinity, oxygen, nutrients and other measurements collected from discrete samples and profile observations during the R/V Keifu Maru II cruise ks201604 (EXPOCODE 49UF20160407) in the East China Sea and North Pacific Ocean from 2016-04-07 to 2016-05-07 (NCEI Accession 0201383)
National Oceanic and Atmospheric Administration, Department of Commerce —
This dataset includes discrete profile measurements of dissolved inorganic carbon (DIC), total alkalinity, pH on total scale, temperature, salinity, oxygen and... - 
  
    Federal
Datasets managed by the NSF Arctic Data Center and archived at the NOAA National Centers for Environmental Information
National Oceanic and Atmospheric Administration, Department of Commerce —
The National Science Foundation (NSF) Arctic Data Center (ADC) preserves and provides access to multi-disciplinary NSF-funded global cryosphere-land-ocean-atmosphere... - 
  
    Federal
NIST Handbook of Basic Atomic Spectroscopic Data - SRD 108
National Institute of Standards and Technology —
This handbook provides a selection of the most important and frequently used atomic spectroscopic data in an easily accessible format. The compilation includes energy... - 
  
    Federal
Partial pressure (or fugacity) of carbon dioxide, dissolved inorganic carbon, pH, alkalinity, temperature, salinity and other variables collected from discrete sample, profile and time series profile observations using Alkalinity titrator, CTD and other instruments from HERMANO GINES in the Caribbean Sea from 1995-11-08 to 2015-07-29 (NCEI Accession 0112926)
National Oceanic and Atmospheric Administration, Department of Commerce —
This dataset includes discrete sample, profile and time series profile data collected from HERMANO GINES in the Caribbean Sea from 1995-11-08 to 2015-07-29. These... - 
  
    Federal
Partial pressure (or fugacity) of carbon dioxide, dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from KNORR in the North Atlantic Ocean and South Atlantic Ocean from 1987-11-24 to 1989-04-12 (NCEI Accession 0117501)
National Oceanic and Atmospheric Administration, Department of Commerce —
This dataset includes chemical, discrete sample, meteorological, physical and profile data collected from KNORR in the North Atlantic Ocean and South Atlantic Ocean... - 
  
    Federal
NIST Atomic Spectral Line Broadening Bibliographic Database
National Institute of Standards and Technology —
This interactive database, maintained by the NIST Atomic Spectroscopy Data Center, contains more than 6000 references, dating from 1889 through current year and is... - 
  
    Federal
NIST Atomic Energy Levels and Spectra Bibliographic Database
National Institute of Standards and Technology —
References contained in this database are from Bibliography on Atomic Energy Levels and Spectra, NBS Special Publication 363 and Supplements, as well as current...