AMTIC - Ambient Monitoring Archive for HAPs
Qlik Archive Data Retrieval Tool
EPA’s new Qlik Archive Data Retrieval Tool allows users to filter and download ambient air toxics monitor data based on user-defined selections. This tool facilitates a faster and more targeted data download.
In March 2026, the EPA published the 2023 Ambient Monitoring Archive (AMA) for the Hazardous Air Pollutants (HAPs) (i.e., "the Archive") that houses over 130 million data records from over 6,000 monitoring sites from 1990 through 2023. Data come from EPA's Air Quality System, the Texas Commission on Environmental Quality, the South Coast Air Quality Management District, the National Atmospheric Deposition Program, the National Oceanic and Atmospheric Administration, and the Massachusetts Institute of Technology, other state, local, tribal, and federal monitoring agencies, and other academic, community, and short-term studies. Due to the size of the 2023 Archive, the Microsoft Access data files are divided by state and year; the .txt and .Rda files (generated by the R programming language) are presented by year.
The Qlik Archive Data Retrieval Tool
The Qlik Archive Data Retrieval Tool allows for user-defined filtering and downloading of ambient air toxics data. Please note it may take up to 60 seconds for the tool to fully load.
Ambient Monitoring HAPs Data By Year
The 2023 Archive for HAPs data from 1990 to 2023 are presented by year in zipped Microsoft Access databases and .txt files. Please note that file sizes range from 6.52 MB to 636 MB.
| Year | Year | Year | Year |
|---|---|---|---|
| 2023 (636 MB) | 2022 (594 MB) | ||
| 2021 (570 MB) | 2020 (277 MB) | 2019 (258 MB) | 2018 (245 MB) |
| 2017 (255 MB) | 2016 (312 MB) | 2015 (303 MB) | 2014 (317 MB) |
| 2013 (290 MB) | 2012 (270 MB) | 2011 (246 MB) | 2010 (234 MB) |
| 2009 (229 MB) | 2008 (212 MB) | 2007 (213 MB) | 2006 (203 MB) |
| 2005 (202 MB) | 2004 (175 MB) | 2003 (150 MB) | 2002 (132 MB) |
| 2001 (126 MB) | 2000 (105 MB) | 1999 (92.3 MB) | 1998 (84.6 MB) |
| 1997 (71.0 MB) | 1996 (59.7 MB) | 1995 (43.3 MB) | 1994 (24.6 MB) |
| 1993 (13.5 MB) | 1992 (9.97 MB) | 1991 (7.92 MB) | 1990 (6.52 MB) |
Air Monitoring HAPs Data By State
Files are also available from 1990 to 2023 by state, the District of Columbia, Puerto Rico, and the Virgin Islands in zipped Microsoft Access databases. Please note that file sizes range from 923 KB to 702 MB.
| State | State | State | State |
|---|---|---|---|
| Alabama (10.4 MB) | Alaska (27.3 MB) | Arizona (22.4 MB) | Arkansas (2.54 MB) |
| California (590 MB) | Colorado (70.2 MB) | Connecticut (35.4 MB) | Delaware (7.63 MB) |
| District of Columbia (22.2 MB) | Florida (27.0 MB) | Georgia (56.5 MB) | Hawaii (26.7 MB) |
| Idaho (3.82 MB) | Illinois (41.5 MB) | Indiana (75.5 MB) | Iowa (5.60 MB) |
| Kansas (5.58 MB) | Kentucky (20.6 MB) | Louisiana (39.2 MB) | Maine (49.4 MB) |
| Maryland (43.8 MB) | Massachusetts (55.9 MB) | Michigan (48.7 MB) | Minnesota (38.5 MB) |
| Mississippi (9.88 MB) | Missouri (29.6 MB) | Montana (8.40 MB) | Nebraska (2.27 MB) |
| Nevada (4.91 MB) | New Hampshire (29.1 MB) | New Jersey (51.7 MB) | New Mexico (8.83 MB) |
| New York (74.3 MB) | North Carolina (19.2 MB) | North Dakota (3.08 MB) | Ohio (27.9 MB) |
| Oklahoma (15.5 MB) | Oregon (26.2 MB) | Pennsylvania (50.1 MB) | Puerto Rico (1.09 MB) |
| Rhode Island (26.2 MB) | South Carolina (16.3 MB) | South Dakota (4.16 MB) | Tennessee (5.89 MB) |
Texas (1 of 2) Texas (2 of 2) | Utah (22.6 MB) | Vermont (21.7 MB) | Virgin Islands (923 KB) |
| Virginia (20.0 MB) | Washington (19.3 MB) | West Virginia (4.65 MB) | Wisconsin (112 MB) |
| Wyoming (5.25 MB) |
All 2023 Archive Monitoring Data and Annual Data Summaries
- All data in the 2023 Archive are presented by year in .Rda files (generated by the R programming language).
- Annual Statistics (XLSX) (200 MB) provides annual statistics by pollutant, site, sampling duration, and year and supporting information assisting in trends analysis.
Supporting Files for the 2023 Archive
- Field Descriptions (PDF) (1 page, 32.7 KB) describes the fields in the 2023 Archive files.
- Data Dictionary (ZIP) (14.8 MB) contains ten data dictionaries needed for describing and standardizing the raw data and are recommended for providing additional context to the concentration records. Data dictionaries are initially retrieved from EPA's AQS website with additional data elements added.
- Supporting appendices (ZIP) (147 MB) contains six supporting appendices including information regarding overlapping records, invalidated records, sampling frequency code corrections, questionable values, negative concentrations, and program rankings.
- Lookup Tables (XLSX) (223 KB) contains additional cross-referenced information in the annual statistics excel file, field descriptions in the annual statistics excel file, R code used to calculate the annual statistics, and other descriptive information.
Supporting Documentation for the 2023 Archive
- Technical Report (55 pages, 1020 KB) provides background information, describes data sources, and documents the improvements, modifications, and additional data incorporated into the development of the 2023 Archive.
- Annual Statistics Documentation (PDF) (14 pages, 874 KB) documents the steps used to calculate the annual statistics along with descriptors of the corresponding R code, the quality assurance methodology and results, and answers to frequent questions.