02/20/2023The July 2023 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
02/01/2023The May-Dec 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
01/08/2023The June 2023 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
01/04/2023The May-Nov 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
01/04/2024The validated April 2023 IMPROVE Aerosol dataset update from UCD was imported into the database.
12/08/2023The Apr-Oct 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
12/07/2023The validated March 2023 IMPROVE Aerosol dataset update from UCD was imported into the database.
11/17/2023The May 2023 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
11/14/2023The 1993-2022 IMPROVE RHR3 (Impairment) 5-year averages were updated (past years) and/or imported (2022) into the database.
11/14/2023The 1993-2022 IMPROVE RHR2 (Haze) 5-year averages were updated (past years) and/or imported (2022) into the database.
11/08/2023The Mar-Sep 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
11/08/2023The validated Jan-Feb 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
10/09/2023The 2016-2022 IMPROVE RHR3 (Impairment) Group Means were updated/imported into the database.
10/09/2023The 2016-2022 IMPROVE RHR3 (Impairment) Daily Budgets were updated/imported into the database.
10/09/2023The 2022 IMPROVE RHR2 Group Means were imported into the database.
10/09/2023The 2022 IMPROVE RHR2 Daily Budgets were imported into the database.
10/06/2023The redelivered full-year Jan-Dec 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
09/28/2023The validated December 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
09/18/2023The March 2023 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
09/07/2023The Dec 2022 - Jul 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
08/25/2023The validated November 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
08/11/2023The February 2023 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
08/11/2023The Nov 2022 - Jun 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
07/25/2023The validated October 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
07/17/2023The January 2023 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
06/01/2023The Sep 2022 - Apr 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
06/01/2023The validated August 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
05/22/2023The November 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
05/02/2023The Aug 2022 - Mar 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
05/01/2023The validated July 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
04/10/2023The October 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
04/05/2023The validated Jun 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
04/03/2023The Jul 2022 - Feb 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
03/29/2023The Oct-Dec 2022 IMPROVE Nephelometer dataset update from ARS was imported into the database.
03/29/2023The validated May 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
03/09/2023The September 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
03/01/2023The May 2022 through Jan 2023 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
03/01/2023The validated April 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
02/14/2023The August 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
02/03/2023The validated March 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
02/02/2023The Mar 2022 through Dec 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
01/19/2023The July 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
01/09/2023The validated February 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
01/03/2023The Feb 2022 through Nov 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
12/21/2022The Jul-Sep 2022 IMPROVE Nephelometer dataset update from ARS was imported into the database.
12/21/2022The validated Jan 2022 IMPROVE Aerosol dataset update from UCD was imported into the database.
12/06/2022The 2021 IMPROVE RHR3 (Impairment) Group Means and IMPROVE RHR2 Group Means were imported into the database.
12/06/2022The 2021 IMPROVE RHR3 (Impairment) Metrics and IMPROVE RHR2 Metrics (daily budgets) were imported into the database.
12/02/2022The Jan 2022 through Oct 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD were imported into the FED database.
11/21/2022The redelivered full-year 2021 IMPROVE Aerosol data from UCD were imported into the FED database.
11/17/2022The May 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
11/02/2022The Jan 2022 through Sep 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD was imported into the FED database.
10/25/2022The validated Dec 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
10/17/2022The April 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
10/03/2022The Dec 2021 through Aug 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD was imported into the FED database.
09/30/2022The Apr-Jun 2022 IMPROVE Nephelometer dataset update from ARS was imported into the FED database.
09/30/2022The validated Oct-Nov 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
09/08/2022The validated September 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
09/06/2022The March 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
09/06/2022The Sep 2021 through Jul 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD was imported into the FED database.
08/08/2022The validated August 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
08/02/2022The Aug 2021 through Jun 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD was imported into the FED database.
07/19/2022The validated July 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
07/05/2022The January 2022 EPA Chemical Speciation Network (CSN) data from AQS were imported into the database.
07/05/2022The Jul 2021 through May 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD was imported into the FED database.
06/27/2022The Jan-Mar 2022 IMPROVE Nephelometer dataset update from ARS was imported into the FED database.
06/27/2022The full record IMPROVE Aerosol special study dataset from the Reno, NV sites (RENO1, RENO2, RENO3) was imported into the FED database.
06/13/2022The December 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
06/13/2022The validated June 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
05/16/2022The November 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
05/16/2022The validated May 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
05/11/2022A new Annual Summary Tool was published to provide access to data and charts based upon the EPA Annual Summary dataset.
05/03/2022The list of Live Visibility Webcams was updated and expanded with several new webcams.
04/20/2022The validated Apr 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
04/14/2022The October 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
04/11/2022The Oct-Dec 2021 IMPROVE Nephelometer dataset update from ARS was imported into the FED database.
04/08/2022The validated Mar 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
03/29/2022The 2018-2021 Clean Air Status and Trends Network (CASTNET) Dry Deposition - Annual dataset update from EPA was imported.
03/28/2022The 2018-2021 NADP National Trends Network (NTN) Annual Precipitation-Weighted Mean Concentrations (PWM) in ueq/L dataset update from NADP was imported.
03/15/2022The Mar 2021 through Jan 2022 IMPROVE Aerosol Preliminary (unvalidated) data from UCD was imported into the FED database.
03/15/2022The September 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
02/28/2022The Jan-Feb 2021 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
02/15/2022The redelivered Jan-Dec 2021 IMPROVE Aerosol Preliminary dataset update from UCD was imported into the FED database.
02/09/2022The 2019-2020 IMPROVE RHR3 (Impairment) Group Means and IMPROVE RHR2 Group Means data were imported into the database.
02/09/2022The 2019-2020 IMPROVE RHR Metrics III (Impairment) and IMPROVE RHR Metrics II (daily budgets) data were imported into the database.
02/07/2022The August 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
02/02/2022The redelivered Jan-Dec 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
01/10/2022The July 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
12/30/2021The Dec 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
12/21/2021The Jul-Sep 2021 IMPROVE Nephelometer dataset update from ARS was imported into the FED database.
12/15/2021The June 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
12/10/2021The Nov 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
12/10/2021The 2018-2021 EPA Nitrogen Dioxide (NO2) (42602) - Hourly data from AQS was imported into the database.
12/08/2021The 2018-2021 EPA Carbon Monoxide (CO) (42101) - Hourly data from AQS was imported into the database.
12/06/2021The 2018-2021 EPA Sulfur Dioxide (SO2) (42401) - Hourly data from AQS was imported into the database.
12/02/2021The 2018-2021 EPA PM10 Mass (81102) - Hourly data from AQS was imported into the database.
12/01/2021The 2018-2021 EPA PM10 Mass (81102) - Daily data from AQS was imported into the database.
11/30/2021The May 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
11/08/2021The 2019-2021 EPA Hourly Ozone data were imported into the database.
11/05/2021The Sep-Oct 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
10/21/2021The 2019-2021 NADP Atmospheric Integrated Research Monitoring Network (AIRMoN) data were imported into the database.
10/20/2021The 2019-2021 NADP Ammonia Monitoring Network (AMoN) data were imported into the database.
10/19/2021The 2020-2021 NADP Mercury Deposition Network (MDN) data were imported into the database.
10/17/2021The Apr-Jun 2021 IMPROVE Nephelometer dataset update from ARS was imported into the FED database.
10/15/2021The 2020 NADP National Trends Network (NTN) Annual Total Wet Deposition and Annual Precipitation-Weighted Mean Concentrations datasets were both imported into the database.
10/14/2021The Jan-Mar 2021 NADP National Trends Network (NTN) data were imported into the database.
10/13/2021The Jan-Apr 2021 EPA Chemical Speciation Network (CSN) data from AQS was imported into the database.
10/12/2021The Jan-Mar 2021 IMPROVE Nephelometer dataset update from ARS was imported into the FED database.
09/20/2021A updated set of Visibility Trends and Composition Tools was added for visualizing haze-related trends and composition from the IMPROVE network.
09/03/2021The Aug 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
06/29/2021The Jun-Jul 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
06/07/2021An updated set of Air Quality Related Values (AQRV) Express Tools was added for analyzing IMPROVE light extinction data.
05/11/2021An updated set of Raw IMPROVE Data Analysis Express Tools was added for visualizing and analyzing raw IMPROVE aerosol data.
04/22/2021An updated set of Haze Analysis Express Tools was added for visualizing and comparing IMPROVE RHR2 and Impairment data.
04/21/2021The May 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
04/05/2021The Apr 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
03/17/2021An updated set of IMPROVE Aerosol Q/A Express Tools was added for analyzing raw IMPROVE aerosol data.
01/20/2021The Feb-Mar 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
01/05/2021The Jul-Sep 2020 IMPROVE Nephelometer data from ARS was imported into the FED database.
09/10/2020The Dec 2019-Jan 2020 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
08/14/2020The Oct-Nov 2019 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
07/02/2020The Sep 2019 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
06/17/2020The Jul-Aug 2019 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
04/15/2020The May-Jun 2019 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
03/05/2020The Jan-Apr 2019 IMPROVE Aerosol dataset update from UCD was imported into the FED database.
10/18/2019The resubmitted Jan-Dec 2018 IMPROVE Aerosol data has been imported into the TSS database.
07/30/2019A new collection of Haze Trends charts for analyzing visibility trends at IMPROVE sites on the most impaired, clearest, and all days has been published.
05/01/2019The IMPROVE substituted data developed by Air Resource Specialists (ARS) have been added to the database and the RHR2 and Impairment datasets have been updated.
03/26/2019A new series of Haze Trends charts have been published to the Haze Analysis Tools under the "Trends" tab.
02/13/2019A new series of Anthro vs. Natural charts have been published to the Haze Analysis Tools under the "Anthro vs. Natural" tabs.
01/29/2019A new feature was added to the Haze Analysis Tools map to display site markers for individual networks and datasets using different shapes, colors, and sizes. A legend was also added.
10/15/2018A new full year (2017) of IMPROVE aerosol data, RHR2, and Impairment data has been added to the database.
10/04/2018Added context-sensitive help icons, popups, and glossary definitions to the Haze Analysis Tools.
10/02/2018An Updates page has been added which can be accessed from the News menu in the top navigation bar.
10/01/2018An Air Quality Glossary has been added which can be accessed from the Help menu in the top navigation bar.
09/28/2018A Find Events tool has been added which can be accessed from the News menu in the top navigation bar.
09/27/2018A Find Sites tool has been added that allows you to find monitoring sites by various search criteria.
08/01/2018Twelve new charts have been added to the draft Haze Analysis Tool, such as monthly, seasonal, and annual charts.
07/27/2018A suite of Visibility Summary tools have been added to provide graphical chart analyses of haze composition and trends in Class I Areas.
07/26/2018A Dataset Detail tool has been added to present detailed information and metadata about available monitoring datasets.
07/05/2018A draft RHR2 vs. Impairment tool has been created to present various charts comparing extinction data by both the RHR2 and Impairment metrics.
06/05/2018A Dataset Catalog tool has been created to help end users find relevant monitoring datasets based on a number of search criteria.