• Organization: U.S. Environmental Protection Agency
• Updated: 2024-12-11

This dataset is non-EPA-owned. Some of the analyses are based on previous use of CMAQ emissions and meteorological files for the ALPACA period. The links to those ScienceHub entries are attached....

• html
• html
• xml
• xml

• Organization: U.S. Environmental Protection Agency
• Updated: 2020-03-12

Nitrate and sulfate are two key components of airborne particulate matter (PM). While multiple formation mechanisms have been proposed for sulfate, current air quality models commonly...

• Organization: U.S. Environmental Protection Agency
• Updated: 2024-11-01T00:00:00.000+00:00

This hosted feature layer, displayed in the Valley Identification Tool, contains the following layers: US Census County Subdivisions in US EPA Regions 1, 2, 3, 9 and 10. EPA overlaid topographic...

• none

• Organization: U.S. Environmental Protection Agency
• Updated: 2024-11-01T00:00:00.000+00:00

Valleys, featured in the Valley Identification Tool, are locations that have a lower elevation than surrounding areas. EPA Region 1 GIS Center applied ArcGIS' Focal Statistics tool to the USGS...

• none

• Organization: National Aeronautics and Space Administration
• Updated: 2026-02-17

NARSTO_STIFS_CANADA_PM_INORG_VOC_DATA is the North American Research Strategy for Tropospheric Ozone (NARSTO) Supersite Transboundary Intensive Field Study (STIFS) Particulate Matter (PM)...

• none
• none
• pdf
• pdf
• pdf
• pdf
• +6 more

• Organization: National Aeronautics and Space Administration
• Updated: 2026-02-17

The Laurentian Great Lakes provide extensive optical and trophic variability across diverse ecosystems, from environments challenged by current and legacy nutrient pollution and continuing water...

• none

• Organization: Department of the Interior
• Updated: 2021-02-11T00:00:00Z

Atmospheric deposition of reactive nitrogen (Nr) due to human activities can have measurable effects on ecosystem processing and export of nutrients, groundwater and surface-water quality. Rates...

• xml
• xml

• Organization: National Aeronautics and Space Administration
• Updated: 2026-02-10

MAPS Overview The MAPS experiment measures the global distribution of carbon monoxide (CO) mixing ratios in the free troposphere. Because of MAPS' previous flights on board the Space Shuttle,...

• none
• none
• pdf
• none
• none
• none
• +6 more

• Organization: National Aeronautics and Space Administration
• Updated: 2026-02-17

MAPS OverviewThe MAPS experiment measures the global distribution of carbon monoxide (CO) mixing ratios in the free troposphere. Because of MAPS' previous flights on board the Space Shuttle, Earth...

• none
• none
• pdf
• none
• none
• none
• +6 more

• Organization: U.S. Environmental Protection Agency
• Updated: 2023-11-16

This is metadata for the figures from an overview paper for the ALPACA Fairbanks winter air quality study. The paper includes only (non-EPA funded/generated) data to support some early analysis...

• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2021-01-06T00:00:00.000+00:00

A multifaceted study of the sediment dwelling benthos was conducted in Mamala Bay to identify suitable species as indicators of sewage enrichment. There are five components to this study - 1)...

• none