Clean Air Status and Trends Network (CASTNET): Visibility

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Nephelometer data (conforms to IMPROVE network standards) from October 1993 to June 2002. This table is no longer updated.

Clean Air Status and Trends Network (CASTNET): Ozone

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8-hour daily maximum ozone concentrations as measured by the Clean Air Status and Trends Network (CASTNET)

Clean Air Status and Trends Network (CASTNET): Ozone

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8-hour daily maximum ozone concentrations as measured by the Clean Air Status and Trends Network (CASTNET)

Clean Air Status and Trends Network (CASTNET) Weekly Ambient Concentrations

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Weekly average air concentrations from CASTNET filter pack data in standard Tuesday 9:00 AM - Tuesday 8:00 AM weeks. The data are collected using an open face, 3-stage filter pack. Data include aerosol concentrations of sulfate, nitrate, ammonium, calcium, sodium, potassium, magnesium and chloride and gaseous concentrations of sulfur dioxide and nitric acid. The QAPP and associated SOPs can be found on the CASTNET website: www.epa.gov/castnet/documents-reports. Site location information is included with this dataset. Citation information for this dataset can be found in the EDG's Metadata Reference Information section and Data.gov's References section.

Clean Air Status and Trends Network (CASTNET) Download Data Module

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The CASTNET Download Data module allows users to select, view, and download CASTNET data (Raw, Aggregate, Modeled & Factual Data) based on user selections. CASTNET sites are located in or near rural areas and sensitive ecosystems collecting data on ambient levels of pollutants where urban influences are minimal. CASTNET, which was initiated in 1986, is able to provide data needed to assess and report on geographic patterns and long-term temporal trends in ambient air pollution and dry atmospheric deposition. CASTNET can also be used to track changes in measurements associated with climate change (such as temperature and precipitation).

Clean Air Status and Trends Network (CASTNET) Hourly Ozone Concentrations

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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. Data are reported to AirNow and EPA's Air Quality System (AQS) database routinely. There are more than 80 CASTNET sites reporting hourly ozone concentrations throughout the United States. Site location information is included with this dataset. The QAPP and associated SOPs can be found on the CASTNET website: www.epa.gov/castnet/documents-reports. Citation information for this dataset can be found in the EDG's Metadata Reference Information section and Data.gov's References section.

Clean Air Status and Trends Network (CASTNET) Hourly Ozone Concentrations

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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. Data are reported to AirNow and EPA's Air Quality System (AQS) database routinely. There are more than 80 CASTNET sites reporting hourly ozone concentrations throughout the United States. Site location information is included with this dataset. The QAPP and associated SOPs can be found on the CASTNET website: www.epa.gov/castnet/documents-reports. Citation information for this dataset can be found in the EDG's Metadata Reference Information section and Data.gov's References section.

Clean Air Status and Trends Network (CASTNET) hourly temperature and other meteorological data (1990 - present)

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Hourly temperature data and other meteorological data (e.g., relative humidity, solar radiation, precipitation, wind direction) are provided at long-term rural air monitoring sites. There are more than 90 CASTNET sites reporting hourly temperature data throughout the United States. These data can be used to assess climate impacts on air quality and trends in temperature from long-term monitoring sites. Meteorological sensors are calibrated to NIST traceable standards. Site location information is included with this dataset. The QAPP and associated SOPs can be found on the CASTNET website: www.epa.gov/castnet/documents-reports. Citation information for this dataset can be found in Data.gov's References section.

Data for APNEP Nitrogen Indicator Report

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Publicly available data sets provided in the links were subsetted for the APNEP region and plotted for the report.

Data for APNEP Nitrogen Indicator Report

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Publicly available data sets provided in the links were subsetted for the APNEP region and plotted for the report.