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NARSTO EPA Supersite (SS) Houston, Ammonia and Nitric Acid Data

Metadata Updated: December 6, 2023

The NARSTO_EPA_SS_HOUSTON_NH3_HNO3_is the North American Research Strategy for Tropospheric Ozone (NARSTO) Environmental Protection Agency (EPA) Supersite (SS) Houston, Ammonia and Nitric Acid Data product. It contains 24-hour integrated measurements of ammonia and nitric acid collected during September 30, 2000 through May 22, 2001 at the Houston Regional Monitoring (HRM) Site 3, Aldine, and Deer Park Houston Supersite monitoring locations. Samples were collected using a coated annular diffusion denuder downstream of a Teflon filter and analyzed by ion chromatography. Data set change history: Measurements of ammonia and nitric acid were quantified as ammonium and nitrate using ion chromatography.

Effective August 27, 2004, the TABLE COLUMN NAME and TABLE COLUMN CAS IDENTIFIER values in the main data table were changed from ammonium and nitrate to ammonia and nitric acid to clarify that these are gas-phase measurements. The data set name was changed from NARSTO EPA_SS_HOUSTON Ammonium and Nitrate Data to NARSTO EPA_SS_HOUSTON Ammonia and Nitric Acid Data. No data values were changed.

The Houston Supersite is one of several Supersites that was established in urban areas within the United States by the EPA to better understand the measurement, sources, and health effects of suspended particulate matter (PM). The overall goals were to characterize the composition and identify the sources of PM in Southeastern Texas, to develop and test new methods for characterizing fine PM, and to collect data on the physical and chemical characterization of fine PM that can be used to support exposure and health effects studies.

NARSTO, which has since disbanded, was a public/private partnership, whose membership spanned across government, utilities, industry, and academe throughout Mexico, the United States, and Canada. The primary mission was to coordinate and enhance policy-relevant scientific research and assessment of tropospheric pollution behavior; activities provide input for science-based decision-making and determination of workable, efficient, and effective strategies for local and regional air-pollution management. Data products from local, regional, and international monitoring and research programs are still available.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Created Date December 1, 2022
Metadata Updated Date December 6, 2023

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date December 1, 2022
Metadata Updated Date December 6, 2023
Identifier C2324344763-LARC_ASDC
Data First Published 2004-09-23
Language en-US
Data Last Modified 2018-04-18
Category NARSTO, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Citation 2004-09-16. Archived by National Aeronautics and Space Administration, U.S. Government, NASA/LARC/SD/ASDC.
Harvest Object Id e1b521aa-5b16-4dee-963b-12aa88695084
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL
Metadata Type geospatial
Old Spatial <?xml version="1.0" encoding="UTF-8"?><gml:Polygon xmlns:gml="" srsName="EPSG:9825"><gml:outerBoundaryIs><gml:LinearRing><gml:posList>29.67 -95.33 29.67 -95.13 29.9 -95.13 29.9 -95.33 29.67 -95.33</gml:posList></gml:LinearRing></gml:outerBoundaryIs><gml:innerBoundaryIs></gml:innerBoundaryIs></gml:Polygon>
Program Code 026:001
Source Datajson Identifier True
Source Hash ae8cdce8947f450b495be5e8c39f8b44fff723708278f4688c83e5723da3456c
Source Schema Version 1.1
Temporal 2000-09-30T00:00:00Z/2001-05-23T23:59:59.999Z

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