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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 http://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.


Yearly Raw Data Files Retrieved From AQS


Year of data, zipped file size, (unzipped file size), Date of extraction

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 http://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.

AQS Frequent Questions | Technology Transfer Network | Air & Radiation


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