![[logo] US EPA](https://www3.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
Download Detailed AQS Data
This page is being replaced by the Air Data download data files page. We will keep this page available for a short time as users make the transition to the new page.
The table below provides links to files of detail data extracted from the AQS database in input transaction format. These files contain data for the entire country on a year-by-year basis, so many of them are very large files.
All data files are zipped to conserve disk space. Refer to our " Tools" page if you need assistance with file types.
Unless otherwise indicated, the unzipped text files match the Raw Data description in the input transaction format (PDF) (11 pp, 114K, About PDF), i.e., Transaction Type = RD. Hourly data is reported with Duration code = 1; Daily data is reported with Duration = 7. The files follow the naming convention of "RD_501_ppppp_yyyy.ZIP" or "RB_503_ppppp_yyyy.ZIP", where "ppppp" = AQS parameter code (or other name when multiple parameter codes are included) and "yyyy" = year of data.
A text file containing site
and monitor records (ZIP, 44M) as of 4/2/14. This
file unzips to a large text file (415M) using different record
types from the same
input transaction format (PDF) (11 pp, 114K,
About PDF).
Site records begin with the letter "A"; monitor records begin with "M".
There is also a file with
descriptions of sites (ZIP, 13M) as of 4/2/14. This file unzips to a PDF in a report format with
one page per site (7386 pp, 16.8M).
Data Reliability
It is important to understand that some air quality data are more reliable than others.
Various methods are used to collect the data. Some methods are reference methods, some are equivalent methods, and some are neither. As a general matter, data collected using EPA reference methods and/ or equivalent methods provide the highest quality data. Data using other methods maybe less reliable or be more uncertain. More information about reference, equivalent methods and other monitoring methods can be found at EPA's Ambient Monitoring Technology Information Center web site at www.epa.gov/ttn/amtic/ or the broader area of the Air Quality and Assessment Division at https://www.epa.gov/air/oaqps/organization/aqad/io.html .
AQS uses a unique code for each different monitoring method. You can access the table containing all monitoring method codes that describes the monitoring method. If the pollutant being measured is one of the criteria pollutants this sampling methodology code will indicate if it is a reference or equivalent method. The table is at www.epa.gov/ttn/airs/airsaqs/manuals/codedescs.htm.
| Pollutant (Parameter Code) File name (substitute year for "yyyy") |
2013 | 2012 | 2011 | 2010 | 2009 | 2008 |
2007 |
2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Carbon Monoxide (42101) RD_501_42101_yyyy.ZIP |
42101_2013 10575 KB (173378KB) 3/20/14 |
42101_2012 12149 KB (196822KB) 3/20/14 |
42101_2011 12272 KB (201022KB) 3/20/14 |
42101_2010 11623 KB (199386KB) 3/20/14 |
42101_2009 10431 KB (206445KB) 05/12/12 |
42101_2008 10566KB (218168KB) 05/12/12 |
42101_2007 10649KB (224159KB) 05/12/12 |
42101_2006 11021KB (232867KB) 05/12/12 |
42101_2005 11771KB (248359KB) 05/12/12 |
42101_2004 12176KB (256346KB) 05/12/12 |
42101_2003 12603KB (262955KB) 05/12/12 |
42101_2002 13248KB (247597KB) 05/12/12 |
42101_2001 14703KB (296633KB) 05/12/12 |
42101_2000 14576KB (298284KB) 05/12/12 |
42101_1999 16114KB (29428KB) 05/12/12 |
42101_1998 15125KB (303718KB) 05/12/12 |
42101_1997 16700KB (305235KB) 05/12/12 |
42101_1996 15371KB (307367KB) 05/12/12 |
42101_1995 16889KB (305667KB) 08/8/11 |
42101_1994 16571KB (297878KB) 4/30/10 |
42101_1993 16221KB (300149KB) 4/30/10 |
| Lead - PB - daily (12128) RD_501_12128_yyyy.ZIP |
12128_2013 10k (109KB) 3/20/14 |
12128_2012 17k (184KB) 3/20/14 |
12128_2011 19k (221KB) 3/20/14 |
12128_2010 23k (298KB) 5/09/13 |
12128_2009 35KB (526KB) 5/09/13 |
12128_2008 64KB (949KB) 05/14/12 |
12128_2007 66 KB (975KB) 05/14/12 |
12128_2006 75KB (1138KB) 05/14/12 |
12128_2005 73KB (1136KB) 05/14/12 |
12128_2004 70KB (1105KB) 05/14/12 |
12128_2003 65KB (1032KB) 05/14/12 |
12128_2002 67KB (1065KB) 05/14/12 |
12128_2001 65KB (1008KB) 05/14/12 |
12128_2000 60KB (999KB) 05/14/12 |
12128_1999 65KB (1070KB) 05/14/12 |
12128_1998 76KB (1261KB) 05/14/12 |
12128_1997 92KB (1546KB) 05/14/12 |
12128_1996 105KB (1752KB) 05/14/12 |
12128_1995 109KB (1809KB) 05/14/12 |
12128_1994 118KB (1939KB) 05/14/12 |
12128_1993 134KB (2004KB) 03/18/10 |
| Lead from TSP-(PB TSP) daily (14129) RD_501_14129_yyyy.ZIP |
14129_2013 90KB (1155KB) 3/20/14 |
14129_2012 104KB (1335KB) 3/20/14 |
14129_2011 78KB (1128KB) 5/09/13 |
14129_2010 71KB (1049KB) 5/09/13 |
14129 2009 43 KB (650KB) 05/14/12 |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
| Nitrogen Dioxide (42602) RD_501_42602_yyyy.ZIP |
42602_2013 13687 KB (223023KB) 3/20/14 |
42602_2012 13161KB (232456KB) 5/09/13 |
42602_2011 13154 KB (232448KB) 5/09/13 |
42602_2010 13420 KB (240918KB) 5/09/13 |
42602_2009 12672KB (237792KB) 11/06/12 |
42602_2008 12507KB (242042KB) 05/16/12 |
42602_2007 12539KB (245258KB) 05/16/12 |
42602_2006 12782KB (248502KB) 05/16/12 |
42602_2005 12881KB (249648KB) 05/16/12 |
42602_2004 13063KB (253753KB) 05/16/12 |
42602_2003 12980KB (250133KB) 05/16/12 |
42602_2002 13175KB (253309KB) 05/16/12 |
42602_2001 13155KB (252212KB) 05/16/12 |
42602_2000 13076KB (250374KB) 05/16/12 |
42602_1999 12811KB (243985KB) 05/16/12 |
42602_1998 12603KB (240956KB) 05/16/12 |
42602_1997 13357KB (234150KB) 05/03/10 |
42602_1996 11822KB (224943KB) 05/16/12 |
42602_1995 11786KB (223379KB) 05/16/12 |
42602_1994 12350KB (214924KB) 03/19/10 |
42602_1993 11410KB (207834KB) 03/19/10 |
| Ozone (44201) - hourly RD_501_44201_yyyy.ZIP |
44201_2013 39811 KB (637700KB) 3/20/14 |
44201_2012 42301 KB (663479KB) 3/20/14 |
44201_2011 42131KB (661874KB) 3/20/14 |
44201_2010 40062 KB (626455KB) 3/20/14 |
44201_2009 37750 KB (609363KB) 3/20/14 |
44201_2008 36113KB (597906KB) 3/20/14 |
44201_2007 35553KB (595415KB) 3/20/14 |
44201_2006 32017KB (577963KB) 05/16/12 |
44201_2005 31673KB (571830KB) 11/07/12 |
44201_2004 34293KB (576694KB) 03/17/11 |
44201_2003 31813KB (573405KB) 05/15/12 |
44201_2002 31380KB (564171KB) 05/15/12 |
44201_2001 30788KB (553675KB) 05/15/12 |
44201_2000 29797KB (536082KB) 05/15/12 |
44201_1999 28755KB (516593KB) 05/15/12 |
44201_1998 28134KB (506173KB) 05/15/12 |
44201_1997 29536KB (492660KB) 09/16/10 |
44201_1996 28350KB (475202KB) 05/03/10 |
44201_1995 28307KB (473813KB) 05/03/10 |
44201_1994 27604KB (463624KB) 05/03/10 |
44201_1993 26315KB (457394KB) 03/22/10 |
| Oxides of Nitrogen - NOX (42603) RD_501_42603_yyyy.ZIP |
42603_2013 13099 KB (208751KB) 3/20/14 |
42603_2012 13886 KB (220372KB) 3/20/14 |
42603_2011 13342 KB (211307KB) 3/20/14 |
42603_2010 13301 KB (215501KB) 3/20/14 |
42603_2009 11579 KB (209020KB) 11/07/12 |
42603_2008 11262KB (210332KB) 05/14/12 |
42603_2007 11079KB (208599KB) 05/14/12 |
42603_2006 9794KB (182248KB) 05/14/12 |
42603_2005 9661KB (178325KB) 05/14/12 |
42603_2004 9644KB (178711KB) 05/14/12 |
42603_2003 10413KB (175607KB) 05/05/10 |
42603_2002 10409KB (174900KB) 05/05/10 |
42603_2001 9979KB (166840KB) 05/05/10 |
42603_2000 9901KB (164951KB) 05/05/10 |
42603_1999 9866KB (163132KB) 09/16/10 |
42603_1998 9416KB (156798KB) 09/16/10 |
42603_1997 9129KB (151451KB) 09/16/10 |
42603_1996 8989KB (14357KB) 09/16/10 |
42603_1995 8813KB (145045KB) 09/16/10 |
42603_1994 8162KB (133755KB) 05/05/10 |
42603_1993 5426KB (90515KB) 3/25/10 |
| PAMS VOC1 RD_501_PAMS VOC_yyyy.ZIP |
PVOC 2013 37627 KB (580042KB) 3/20/14 |
PVOC 2012 48113 KB (741846KB) 3/20/14 |
PVOC 2011 51113 KB (802378KB) 3/20/14 |
PVOC 2010 42197KB (664005KB) 3/20/14 |
PVOC_2009 39702KB (622250KB) 3/20/14 |
PVOC_2008 36213KB (613063KB) 5/09/13 |
PVOC_2007 43684KB (670039KB) 3/20/14 |
PVOC_2006 41279KB (628594KB) 3/20/14 |
PVOC_2005 35216KB (577867KB) 5/09/13 |
PVOC_2004 32008KB (526197KB) 5/09/13 |
PVOC_2003 31405KB (511644KB) 5/09/13 |
PVOC_2002 30967KB (521106KB) 5/09/13 |
PVOC_2001 33726KB (565594KB) 5/09/13 |
PVOC_2000 30029KB (507904KB) 5/09/13 |
PVOC_1999 28816KB (492769KB) 5/09/13 |
PVOC_1998 27994KB (471919KB) 5/09/13 |
PVOC_1997 22985KB (386472KB) 5/09/13 |
PVOC_1996 17900KB (300425KB) 5/09/13 |
PVOC_1995 14462KB (223253KB) 3/20/14 |
PVOC_1994 5712KB (83646KB) 3/20/14 |
PVOC_1993 2217KB (34014KB) 3/20/14 |
| PM 2.5 - Local Conditions4 (88101) RD_501_88101_yyyy.ZIP |
88101_2013 12267 KB (195306KB) 3/20/14 |
88101_2012 10553 KB (170716KB) 3/20/14 |
88101_2011 9354 KB (149042KB) 3/20/14 |
88101_2010 6858 KB (106531KB) 3/20/14 |
88101_2009 3647KB (56793KB) 3/20/14 |
88101_2008 1156KB (16394KB) 3/20/14 |
88101_2007 837 KB (11185KB) 3/20/14 |
88101_2006 799KB (10678KB) 3/20/14 |
88101_2005 846KB (11254KB) 3/20/14 |
88101_2004 845KB (11408KB) 3/20/14 |
88101_2003 860KB (11594KB) 3/20/14 |
88101_2002 949 KB (12913KB) 3/20/14 |
88101_2001 947 KB (12797KB) 3/20/14 |
88101_2000 896KB (12056KB) 3/20/14 |
88101_1999 624KB (8392KB) 10/1/10 |
88101_1998 4KB (48KB) 6/04/09 |
88101_1997 4KB (9KB) 4/2/10 |
no data reported |
no data reported |
no data reported |
no data reported |
| PM Fine Speciation2,3,5 RD_501_SPEC_yyyy.ZIP |
SPEC_2013 5792KB (63220KB) 3/20/14 |
SPEC_2012 6249 KB (68075KB) 3/20/14 |
SPEC_2011 5638 KB (68122KB) 11/13/13 |
SPEC_2010 5286 KB (63841KB) 11/13/13 |
SPEC_2009 1476KB (18624KB) 12/21/12 |
SPEC_2008 2638KB (36812KB) 12/21/12 |
SPEC_2007 3003KB (39847KB) 12/21/12 |
SPEC_2006 7131KB (87390KB) 12/21/12 |
SPEC_2005 8180KB (99907KB) 12/21/12 |
SPEC_2004 8275KB (103442KB) 12/21/12 |
SPEC_2003 7924KB (97091KB) 12/21/12 |
SPEC_2002 6866KB (86664KB) 12/21/12 |
SPEC_2001 3214KB (41552KB) 12/21/12 |
SPEC_2000 1078KB (14330KB) 12/21/12 |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
| PM Fine Speciation-Blanks6 RD_503_Blanks_yyyy.ZIP |
BLANKS_2013 362KB (4782KB) 4/2/14 |
BLANKS_2012 453KB (6091KB) 4/2/14 |
BLANKS_2011 435KB (5875KB) 4/2/14 |
BLANKS_2010 870KB (11688KB) 4/2/14 |
BLANKS_2009 747 KB (9759KB) 4/2/14 |
BLANKS_2008 757 KB (97501KB) 4/2/14 |
BLANKS_2007 1015 KB (12475KB) 4/2/14 |
BLANKS_2006 1202KB (14255KB) 4/2/14 |
BLANKS_2005 1414KB (16785KB) 4/2/14 |
BLANKS_2004 1498KB (20115KB) 05/14/12 |
BLANKS_2003 1444KB (17148KB) 4/2/14 |
BLANKS_2002 952KB (11994KB) 05/17/12 |
BLANKS_2001 514 KB (6262KB) 4/2/14 |
BLANKS_2000 117KB (1658KB) 05/17/12 |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
no data reported |
| PM Fine Speciation-IMPROVE7 RD_501_IMPROVE_yyyy.ZIP |
No Data Reported | No Data Reported | IMPROVE_2011 6599KB (76051KB) 5/09/13 |
IMPROVE_2010 6246KB (71076KB) 11/12/12 |
IMPROVE_2009 6400 KB (72400KB) 11/12/12 |
IMPROVE_2008 7178KB (79692KB) 09/17/13 |
IMPROVE_2007 8247KB (87046KB) 11/12/12 |
IMPROVE_2006 7976KB (83450KB) 11/12/12 |
IMPROVE_2005 8765KB (91827KB) 11/12/12 |
IMPROVE_2004 10148KB (106297KB) 11/12/12 |
IMPROVE_2003 9291KB (96201KB) 11/12/12 |
IMPROVE_2002 8447KB (86770KB) 11/12/12 |
IMPROVE_2001 7109KB (72469KB) 11/12/12 |
IMPROVE_2000 4612KB (48351KB) 11/12/12 |
IMPROVE_1999 3418KB (37968KB) 11/12/12 |
IMPROVE_1998 3501KB (38350KB) 11/12/12 |
IMPROVE_1997 3555KB (38497KB) 11/12/12 |
IMPROVE_1996 3389KB (36757KB) 11/12/12 |
IMPROVE_1995 3309KB (35610KB) 11/12/12 |
IMPROVE_1994 3202KB (33758KB) 11/12/12 |
IMPROVE_1993 3202KB (33758KB) 11/12/12 |
| PM 10 (81102) RD_501_81102_yyyy.ZIP |
81102_2013 11306 KB (174564KB) 3/23/14 |
81102_2012 11306 KB (172829KB) 3/23/14 |
81102_2011 10530KB (159682KB) 3/23/14 |
81102_2010 148009 KB (148009KB) 3/23/14 |
81102_2009 9290KB (141548KB) 3/23/14 |
81102_2008 8889KB (136408KB) 3/23/14 |
81102_2007 7809KB (129255KB) 05/16/12 |
81102_2006 7753KB (128196KB) 05/16/12 |
81102_2005 7606KB (125694KB) 05/16/12 |
81102_2004 7060KB (116266KB) 08/22/11 |
81102_2003 6510KB (106660KB) 05/16/12 |
81102_2002 6196KB (101597KB) 05/16/12 |
81102_2001 5971KB (97413KB) 05/16/12 |
81102_2000 4791KB (78079KB) 05/16/12 |
81102_1999 4026KB (65522KB) 05/16/12 |
81102_1998 4351KB (72457KB) 05/16/12 |
81102_1997 4819KB (81217KB) 05/16/12 |
81102_1996 4332KB (72798KB) 05/16/12 |
81102_1995 3687KB (61754KB) 05/16/12 |
81102_1994 2892KB (48195KB) 05/16/12 |
81102_1993 1963KB (29861KB) 05/06/10 |
| PM 2.5 Non Reference Method8 -Hourly (88500 _1&2 ) RD_501_88501_2_yyyy.ZIP |
88501/2 2013 24447 KB (370178KB) 3/23/14 |
88501/2 2012 28214 KB (427134KB) 3/23/14 |
88501/2 2011 30019 KB (455042KB) 3/23/14 |
88501/2 2010 31485 KB (478941KB) 3/23/14 |
88501/2_2009 32423KB (491818KB) 3/23/14 |
88501/2_2008 32131 KB (497399KB) 3/23/14 |
88501/2 2007 29860KB (461274KB) 3/23/14 |
88501/2_2006 24256KB (377570KB) 3/23/14 |
88501/2_2005 20438KB (317865KB) 3/23/14 |
88501/2_2004 16822KB (261905KB) 3/23/14 |
88501/2_2003 12660KB (198497KB) 3/23/14 |
88501/2_2002 8958KB (140559KB) 3/23/14 |
88501/2_2001 6243 KB (97366KB) 3/23/14 |
88501/2_2000 3768KB (57825KB) 3/23/14 |
88501/2_1999 KB (16410KB) 3/23/14 |
88501/2_1998 208KB (3345KB) 3/23/14 |
88501/2_1997 42KB (734KB) 3/23/14 |
88501/2_1996 42KB (734KB) 5/14/10 |
88501/2_1995 42KB (734KB) 5/14/10 |
88501/2_1994 42KB (734KB) 5/14/10 |
no data reported |
| Reactive Oxides of Nitrogen - NOY (42600) RD_501_42600_yyyy.ZIP |
42600_2013 3395 KB (50344KB) 3/23/14 |
42600_2012 3560KB (52483KB) 3/23/14 |
42600_2011 3458KB (51001KB) 3/23/14 |
42600_2010 1602KB (23613KB) 3/23/14 |
42600_2009 1313KB (20941KB) 11/08/12 |
42600_2008 1335KB (19554KB) 4/7/10 |
42600_2007 928KB (15140KB) 03/15/12 |
42600_2006 878KB (13468KB) 05/06/10 |
42600_2005 745KB (11744KB) 4/7/10 |
42600_2004 644KB (10041KB) 4/7/10 |
42600_2003 567KB (9182KB) 4/7/10 |
42600_2002 524KB (8311KB) 4/7/10 |
42600_2001 633KB (9994KB) 4/7/10 |
42600_2000 517KB (8101KB) 4/7/10 |
42600_1999 544KB (8486KB) 4/7/10 |
42600_1998 561KB (9108KB) 4/7/10 |
42600_1997 325KB (4973KB) 4/7/10 |
42600_1996 280KB (4279KB) 4/7/10 |
42600_1995 224KB (3472KB) 4/7/10 |
no data reported |
no data reported |
| Sulfur Dioxide (42401) RD_501_42401_ 1H_yyyy.ZIP (Hourly data) |
42401 2013 14405KB (271816KB) 3/23/14 |
42401 2012 14676KB (278659KB) 3/23/14 |
42401 2011 14447KB (2732254KB) 3/23/14 |
42401 2010 14099KB (272139KB) 3/23/14 |
42401_2009 14158KB (278692KB) 3/23/14 |
42401_2008 13735KB (294229KB) 11/07/12 |
42401_2007 14425KB (310506KB) 05/16/12 |
42401_2006 14252KB (309154KB) 05/16/12 |
42401_2005 14673KB (316340KB) 05/16/12 |
42401_2004 16353KB (322704KB) 09/13/10 |
42401_2003 15279KB (327568KB) 05/16/12 |
42401_2002 15279KB (327568KB) 05/16/12 |
42401_2001 16423KB (350675KB) 05/16/12 |
42401_2000 16969KB (359781KB) 05/16/12 |
42401_1999 17425KB (367690KB) 05/16/12 |
42401_1998 20023 KB (386480KB) 3/23/14 |
42401_1997 20537KB (396496KB) 05/06/10 |
42401_1996 21075KB (407630KB) 05/06/10 |
42401_1995 21343KB (412689KB) 05/06/10 |
42401_1994 21562KB (410096KB) 4/7/10 |
42401_1993 21680KB (414204KB) 4/7/10 |
| Sulfur Dioxide (42401) RD_501_42401_5M_yyyy.ZIP (5 minute data) |
42401 2013 1373KB (68739KB) 3/23/14 |
42401 2012 1426 KB (71263KB) 3/23/14 |
42401 2011 1350KB (67602KB) 3/23/14 |
42401 2010 24325KB (504770KB) 3/23/14 |
42401_2009 713KB (15658KB) 11/08/12 |
42401_2008 998KB (22404KB) 11/08/12 |
42401_2007 1329KB (30398KB) 05/17/12 |
42401_2006 1340KB (30490KB) 05/17/12 |
42401_2005 1887KB (39611KB) 3/27/14 |
42401_2004 1790KB (40540KB) 05/17/12 |
42401_2003 1479KB (32639KB) 05/17/12 |
42401_2002 4124KB (91482KB) 05/17/12 |
42401_2001 478KB (9585KB) 05/17/12 |
42401_2000 17419KB (366902KB) 05/17/12 |
42401_1999 17952KB (373818KB) 05/17/12 |
42401_1998 18310KB (386967KB) 05/17/12 |
42401_1997 20537KB (396496KB) 05/06/10 |
42401_1996 21075KB (407630KB) 05/06/10 |
42401_1995 21343KB (412689KB) 05/06/10 |
42401_1994 21562KB (410096KB) 4/7/10 |
42401_1993 21680KB (414204KB) 4/7/10 |
1 parmcodesbyclasscode.xls (9/27/07, 84K) Look in spreadsheet for "Volatile Organic Compound subset of the PAMS Parameters"
2 parmcodesbyclasscode.xls (9/27/07, 84K) Look in spreadsheet for "PM2.5 Speciation"
3 Current speciation data files contain the "raw" speciation data from the national PM2.5 network. The organic carbon data are reported as measured and have not been blank-corrected. The EPA is currently exploring options for correcting carbon data. Guidance will be posted when available. Please review the attached technical note from Phil Lorang.
4 Before 2008, 88101 (PM2.5 at local conditions) data only includes the filter-based methods so only 24-hr duration data; no hourly data is available. The continuous monitors (hourly measurements) for PM2.5 didn't receive FRM approval until mid-2007, and thia dta wasn't accepted as 88101 datain AQS until Jan. 2008.5 "RD_501_SPEC_yyyy.ZIP" - These files contain the PM2.5 data concentrations as well as analysis of the particulate for metals, sulfate, nitrate, carbon, etc. that helps to determine what is the main cause of the particulate concentrations. These data (including the different chemical analysis that are performed) are not collected with EPA approved reference or equivalent methods, but rather methods designed specifically for this type of analyses and as such for PM2.5. There is more uncertainty associated with these data. These data are generally not used for regulatory purposes but more for research and to assist in control strategy development. These samples are collected with 24-hr samplers midnight to midnight local standard time with different sampling frequencies depending on the site location.
6 "RD_503_Blanks_yyyy.ZIP" (PM Fine Speciation-Blanks) - The Blanks data files are for the PM2.5 speciation sites and parameters, and reflect the concentrations of the individual species determined for both “TRIP” and “FIELD”. These data values are reported to AQS beginning in 2003. These files use a different format - "RB" instead of RD. The "503" in the file names also indicates this different format.
7 "RD_501_IMPROVE_yyyy.ZIP" (PM Fine Speciation–IMPROVE) -
The “Interagency Monitoring of Protected Visual Environments” data for 1988 to 2004
(also available from http://vista.cira.colostate.edu/IMPROVE/
)
are available here in AQS format to simplify the combined analysis with the PM2.5
speciation data. Data for earlier years not included in the table above
are available upon request.
8 This file contains non-reference method continuous PM2.5 data, which includes the pre-2008 hourly PM2.5 data that was not accepted as 88101. This file includes 88500/PM2.5 Total Atmospheric, 88501/PM2.5 Raw Data or 88502/Acceptance PM2.5 AQI and speciation mass.
SO2 is displayed Hourly
More information about PM2.5 monitoring methods can be found on EPA's Ambient Monitoring Technology Center web site at www.epa.gov/ttn/amtic. Information about the new PM rule is available at https://www.epa.gov/pm/actions.html.
New files may be added from time to time, and some files may be updated from time to time. Files for the more current years, will be updated twice a year: May and November. The date of extraction for each file is noted in the table above along with the file name and size.
File names beginning with "RD_501" indicate the file was created using the AMP501 - Extract Raw Data Report. AMP501 produces a zipped file that includes a "pdf" file that is actually the cover page showing the criteria used to create the file, and a "txt" file with the reported sample values.
File names beginning with "RB_503" indicate the file was created using the AMP503 - Extract Blanks Data Report. Like AMP501, AMP503 produces a zipped file that includes a "pdf" file that is the cover page showing the criteria used to create the file, and a "txt" file with the reported sample values.
If you find an error in AQS, we hope you will let us know so that we may correct it. You may use the Contact Us link or you may contact the people directly responsible for the data. Air monitoring: state environmental agencies
For data not otherwise available, please use the AQS Data Mart.