Dataset Update History

Below is a list of updates to the database in reverse chronological order. Currently, there is no predetermined schedule by which updates are made. In general, the project team makes the decision to update a given dataset based on an ad hoc assessment of demand, availability, and available resources. If you would like to see a particular dataset updated, please contact us.
UpdateDateDatasetDatasetItemDateRangeSitesParamsRecords
11/21/2022IMPROVE AerosolIMPAER_UCD_2021_Redelivery_R20221118_I2022112101/01/21 - 12/30/21161992,071,642
11/17/2022EPA CSNEPACSN_2021_2022p_R20221117_I20221117_STEP201/01/21 - 09/28/22147941,371,614
11/01/2022IMPROVE Aerosol PreliminaryIMPAERPRE_UCD_202201_202209_R20221101_I2022110101/02/22 - 09/29/2215899599,760
10/25/2022IMPROVE AerosolIMPAER_UCD_202112_R20221021_I2022102512/03/21 - 12/30/2115899169,105
10/17/2022EPA CSNEPACSN_2021_2022p_R20221017_I20221017_STEP201/01/21 - 08/27/22147931,291,395
10/03/2022IMPROVE Aerosol PreliminaryIMPAERPRE_UCD_202112_202208_R20221003_I2022100312/03/21 - 08/30/2215899683,840
09/30/2022IMPROVE NephelometerIMPNEP_ARS_20220401_20220630_R20220928_I2022093004/01/22 - 06/30/2210487,360
09/30/2022IMPROVE AerosolIMPAER_UCD_202111_R20220929_I2022093011/03/21 - 11/30/2115899169,210
09/30/2022IMPROVE AerosolIMPAER_UCD_202110_R20220916_I2022093010/01/21 - 10/31/2115899186,131
09/22/2022NADP NTN - Weekly ConcentrationsNADP_NTN_ALL_Weekly_R20220922_I2022092207/11/78 - 01/26/22387136,010,979
09/08/2022IMPROVE AerosolIMPAER_UCD_202109_R20220906_I2022090709/01/21 - 09/28/2115999170,260
09/06/2022EPA CSNEPACSN_2021_2022p_R20220906_I20220906_STEP201/01/21 - 06/28/22145891,192,574
09/06/2022IMPROVE Aerosol PreliminaryIMPAERPRE_UCD_202109_202207_R20220901_I2022090609/01/21 - 07/31/22160991,170,832
08/10/2022EPA CSNEPACSN_Supplemental_2021_2022p_R20220810_I20220810_STEP201/01/21 - 06/28/229485568,005
08/10/2022EPA CSNEPACSN_2021_2022p_R20220810_I20220810_STEP201/01/21 - 03/30/225282546,979
08/09/2022EPA CSNEPACSN_2021_2022p_R20220809_I20220809_STEP201/01/21 - 06/28/22145891,114,985
08/08/2022IMPROVE AerosolIMPAER_UCD_202108_R20220808_R2022080808/02/21 - 08/29/2115999170,260
08/02/2022IMPROVE Aerosol PreliminaryIMPAERPRE_UCD_202108_202206_R20220801_I2022080208/02/21 - 06/28/22161991,243,111
07/19/2022IMPROVE AerosolIMPAER_UCD_202107_R20220718_R2022071907/01/21 - 07/31/2116099171,289
07/15/2022EPA CSNEPACSN_2018_2022_R20220715_I20220715_STEP201/01/18 - 04/30/221611083,991,623
07/05/2022EPA CSNEPACSN_2021_2022_R20220705_I20220705_STEP201/01/21 - 04/30/22144891,037,620
07/05/2022IMPROVE Aerosol PreliminaryIMPAERPRE_UCD_202107_202205_R20220701_I2022070507/01/21 - 05/29/22160991,222,566
06/27/2022IMPROVE NephelometerIMPNEP_ARS_20220101_20220331_R20220627_I2022062701/01/22 - 03/31/2210486,400
06/27/2022IMPROVE AerosolIMPAER_UCD_RENO_ALL_R20220627_I2022062701/25/20 - 06/14/2139447,244
06/13/2022IMPROVE AerosolIMPAER_UCD_202106_R20220610_I2022061306/03/21 - 06/30/2116099170,995
06/13/2022EPA CSNEPACSN_2021_R20220613_I20220613_STEP201/01/21 - 12/30/2114489955,644
06/02/2022IMPROVE Aerosol PreliminaryIMPAERPRE_UCD_202106_202204_R20220601_I2022060106/01/21 - 04/29/22161991,147,645
05/16/2022EPA CSNEPACSN_2021_R20220516_I20220516_STEP201/01/21 - 12/30/2114489878,391
05/16/2022IMPROVE AerosolIMPAER_UCD_202105_R20220513_I2022051605/01/21 - 05/31/2116099187,916
04/20/2022IMPROVE AerosolIMPAER_UCD_Apr_2021_R20220419_I2022042004/01/21 - 04/29/2116099171,301
04/14/2022EPA CSNEPACSN_2021_R20220414_I20220414_STEP201/01/21 - 12/30/2114489802,599
04/11/2022IMPROVE NephelometerIMPNEPH_ARS_20211001_20211231_R20220330_I2022041110/01/21 - 12/31/2110488,320
04/11/2022IMPROVE NephelometerIMPNEPH_ARS_20210701_20210930_R20211221_I2022041107/01/21 - 09/30/2111497,152
04/11/2022IMPROVE NephelometerIMPNEPH_ARS_20210401_20210630_R20210917_I2022041104/01/21 - 06/30/2111496,040
04/11/2022IMPROVE AerosolIMPAER_UCD_Mar_2021_R20220405_I2022041103/02/21 - 03/30/2116199172,096
03/29/2022CASTNET Dry Deposition - AnnualCASTNET_DRYDEP_ANNUAL_R20220328_I2022032801/01/87 - 01/01/211071023,550
03/28/2022NADP NTN - Annual PWM (ueq/L)NADP_NTN_PWM_ANNUAL_UEQL_ALL_R20220328_I2022032801/01/78 - 01/01/2038412108,444
03/15/2022IMPROVE Aerosol PreliminaryIMPAERPRE_UCD_202103_202201_R20220315_I2022031503/01/21 - 01/29/22164991,117,580
03/15/2022EPA CSNEPACSN_2021_R20220315_I20220315_STEP201/01/21 - 12/30/2114489716,218
02/26/2022IMPROVE AerosolIMPAER_UCD_Jan_Feb_2021_R20220225_I2022022601/01/21 - 02/28/2116199344,720
02/15/2022IMPROVE Aerosol PreliminaryIMPAERPRE_UCD_2021_R20220215_I2022021501/01/21 - 12/30/21164991,270,337
02/08/2022IMPROVE RHR3 Group MeansIMPRHR3_Group_Means_R20220207_I2022020801/01/89 - 01/01/2017634698,088
02/08/2022IMPROVE RHR3 MetricsIMPRHR3_Daily_Budgets_R20220207_I2022020801/04/89 - 12/29/201895822,390,668
02/07/2022IMPROVE RHR2 Group MeansIMPRHR2_Group_Means_R20220207_I2022020701/01/89 - 01/01/2020921443,772
02/07/2022IMPROVE RHR2 MetricsIMPRHR2_Daily_Budgets_R20220207_I2022020703/02/88 - 12/30/202302612,628,616
02/07/2022EPA CSNEPACSN_2021_R20220207_I20220207_STEP201/01/21 - 11/30/2114489637,894
02/02/2022IMPROVE AerosolIMPAER_UCD_2020_Redelivery_R20220131_I2022020201/01/20 - 12/30/20161992,088,061
01/10/2022EPA CSNEPACSN_2021_R20220110_I20220110_STEP201/01/21 - 10/31/2114489555,497
12/30/2021IMPROVE AerosolIMPAER_UCD_202012_R20211229_I2021123012/02/20 - 12/30/2016199172,360
12/20/2021GEOS-Chem MERRA v9-02GEOS_CHEM_MERRA_SITE_AER_R20210429_I2021122001/01/04 - 12/31/1217173,935,736
12/15/2021EPA CSNEPACSN_2021_R20211215_I20211215_STEP201/01/21 - 09/26/2114489477,382
12/10/2021IMPROVE AerosolIMPAER_UCD_202011_R202111210_I20211121011/02/20 - 11/30/2016199172,360
12/04/2021EPA CO (42101) - HourlyEPACOH_1980_2021p_R20211203_I2021120301/01/80 - 10/31/2116221139,056,124
12/03/2021EPA SO2 (42401) - HourlyEPASO2H_1989_2021p_R20211202_I2021120201/01/89 - 10/31/2117321149,617,242
12/02/2021EPA PM10 Mass (81102) - HourlyEPAPM10MH_1988_2021_R20211130_I2021113001/01/89 - 10/31/21754151,284,329
12/01/2021EPA PM10 Mass (81102) - DailyEPAPM10MD_1981_2021_R20211130_I20211130_STEP108/21/82 - 10/31/21319912,883,948
11/30/2021EPA CSNEPACSN_2021_R20211130_I20211130_STEP201/01/21 - 09/26/2114489399,115
11/05/2021IMPROVE AerosolIMPAER_UCD_202010_R20211105_I2021110510/01/20 - 10/31/2016199172,465
11/05/2021IMPROVE AerosolIMPAER_UCD_202009_R20210921_I2021110509/01/20 - 09/30/2016199172,360
11/04/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_1985_1989_R20211026_I20211104_STEP201/01/85 - 12/31/891001124,586,276
11/04/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_1990_1994_R20211026_I20211104_STEP201/01/90 - 12/31/941238131,608,496
10/29/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_1995_1999_R20211026_I20211028_STEP201/01/95 - 12/31/991343135,263,143
10/29/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2000_2004_R20211026_I20211028_STEP201/01/00 - 12/31/041443140,137,655
10/29/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2005_2009_R20211026_I20211028_STEP201/01/05 - 12/31/091474142,168,747
10/28/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2010_2014_R20211026_I20211028_STEP201/01/10 - 12/31/141476144,997,308
10/28/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2015_R20211026_I20211028_STEP201/01/15 - 12/31/15129319,003,963
10/28/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2016_R20211026_I20211028_STEP201/01/16 - 12/31/16128319,166,658
10/28/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2017_R20211026_I20211028_STEP201/01/17 - 12/31/17128319,434,844
10/28/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2018_R20211026_I20211028_STEP201/01/18 - 12/31/18127619,446,012
10/28/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2019_R20211026_I20211028_STEP201/01/19 - 12/31/19124119,142,786
10/28/2021EPA Ozone (O3) (44201) - HourlyEPAOZONEH_2020_2021p_R20211026_I20211026_STEP301/01/20 - 09/30/211251114,374,317
10/21/2021NADP AIRMoNNADP_AIRMoN_ALL_R20211020_I2021102009/23/92 - 08/28/191217498,712
10/20/2021NADP AMoNNADP_AMoN_ALL_R20211020_I2021102012/12/12 - 02/09/21128280,704
10/19/2021NADP MDNNADP_MDN_ALL_R20211019_I2021101903/05/96 - 01/27/211965547,985
10/15/2021NADP NTN - Annual PWM (mg/L)NADP_NTN_PWM_ALL_R20211014_I2021101401/01/78 - 01/01/2038413117,481
10/15/2021NADP NTN - Total Wet DepositionNADP_NTN_TWD_ALL_R20211014_I2021101401/01/78 - 01/01/2038413117,481
10/14/2021NADP NTN - Weekly ConcentrationsNADP_NTN_ALL_R20211013_I2021101307/11/78 - 11/24/21385146,370,672
10/13/2021EPA CSNEPACSN_2021_R20211013_I20211013_STEP101/01/21 - 08/26/2114491318,110
10/12/2021IMPROVE NephelometerIMPNEPH_ARS_20210101_20210331_R20210614_I2021101201/01/21 - 03/31/2111495,040
10/12/2021IMPROVE NephelometerIMPNEPH_ARS_20201001_20201231_R20210330_I2021101210/01/20 - 12/31/2011497,152
09/03/2021IMPROVE AerosolIMPAER_UCD_202008_R20210902_I2021090308/01/20 - 08/31/2016199189,460
06/29/2021IMPROVE AerosolIMPAER_UCD_202006_202007_R20210629_I2021062906/02/20 - 07/30/2016199340,730
06/29/2021IMPROVE AerosolIMPAER_UCD_202005_R20210419_I2021042105/03/20 - 05/30/2015999170,260
06/14/2021EPA CSNEPACSN_2016_2021_R20210614_I20210614_STEP101/01/16 - 04/28/211681124,968,846
06/14/2021EPA CSNEPACSN_2010_2015_R20210614_I20210614_STEP101/01/10 - 12/31/152241095,302,337
06/14/2021EPA CSNEPACSN_2000_2009_R20210614_I20210614_STEP101/02/00 - 12/31/093372569,352,800
05/17/2021IMPROVE RHR2 Group MeansHALE1_HAVO1_TSS_Gantt_Adj_RHR2_Group_Means_R20210406_I2021051401/01/01 - 01/01/193216,804
05/17/2021IMPROVE RHR3 Group MeansHALE1_HAVO1_TSS_Gantt_Adj_RHR3_Group_Means_R20210406_I2021051401/01/01 - 01/01/1933511,340
04/29/2021IMPROVE RHR2 Group MeansIMPRHR2_Group_Means_R20201208_I2021012101/01/89 - 01/01/1920621427,014
04/29/2021IMPROVE RHR2 MetricsIMPRHR2_Daily_Budgets_R20201208_I2021012103/02/88 - 12/29/192282612,118,392
04/29/2021IMPROVE RHR3 Group MeansIMPRHR3_Group_Means_R20201208_I2021012101/01/89 - 01/01/1917634673,200
04/27/2021IMPROVE RHR3 MetricsIMPRHR3_Daily_Budgets_R20201208_I2021012101/04/89 - 12/29/191895821,561,964
04/05/2021IMPROVE AerosolIMPAER_UCD_202004_R20210305_I2021032604/03/20 - 04/30/2015999170,260
02/25/2021CASTNet DryChemCASTNET_DRYCHEM_ALL_R20210224_I2021022401/13/87 - 11/30/20131162,189,520
02/23/2021EPA PM2.5 Mass (88502) - DailyAQSPM25_Daily_88502_2000_2021p_R20210220_I2021022201/01/00 - 08/31/205891588,167
02/23/2021EPA PM2.5 Mass (88502) - HourlyAQSPM25_Hourly_88502_2000_2021p_R20210220_I2021022201/01/00 - 01/31/21854154,592,209
02/22/2021EPA PM2.5 Mass FRM (88101) - DailyAQSFRM_Hourly_88101_2000_2021p_R20210220_I2021022203/15/08 - 01/31/21833136,921,310
02/22/2021EPA PM2.5 Mass FRM (88101) - DailyAQSFRM_Daily_88101_2000_2021p_R20210220_I2021022201/01/00 - 01/03/21177912,617,078
01/20/2021IMPROVE AerosolIMPAER_UCD_202003_R20201217_I2021012003/01/20 - 03/31/2015999187,286
01/20/2021IMPROVE AerosolIMPAER_UCD_2019_R20201208_I2021012001/03/19 - 12/29/19160992,059,485
01/20/2021IMPROVE AerosolIMPAER_UCD_202002_R20201021_I2021012002/03/20 - 02/27/2015999153,234
01/05/2021IMPROVE NephelometerIMPNEP_ARS_20200701_20200930_R20201230_I2021010507/01/20 - 09/30/2011497,152
10/05/2020IMPROVE NephelometerIMPNEP_ARS_20200401_20200630_R20200929_I2020100504/01/20 - 06/30/2011496,096
09/10/2020IMPROVE AerosolIMPAER_UCD_201912_202001_R20200909_I2020091012/02/19 - 01/31/2016099358,575
06/30/2020IMPROVE NephelometerIMPNEP_ARS_20200101_20200331_R20200630_I2020063001/01/20 - 03/31/2011496,096
05/28/2020IMPROVE RHR2 MetricsIMPRHR2_Group_Means_R20200423_I2020052801/01/89 - 01/01/1820421408,744
05/28/2020IMPROVE RHR3 MetricsIMPRHR3_Group_Means_R20200423_I2020052801/01/89 - 01/01/1817634645,252
05/28/2020IMPROVE RHR2 MetricsIMPRHR2_Daily_Budgets_Full_Record_R20200423_I2020051303/02/88 - 12/31/182272511,167,550
05/27/2020IMPROVE Natural Conditions (2064)IMPRHR2_Natural_Conditions_R20200430_I2020052701/01/64 - 01/01/641891712,852
05/27/2020IMPROVE RHR3 Endpoints (2064)IMPRHR3_Endpoints_R20200423_I2020052601/01/64 - 01/01/64204204,080
05/24/2020IMPROVE RHR3 MetricsIMPRHR3_Daily_Budgets_Full_Record_R20200423_I2020051101/04/89 - 12/31/181895820,676,652
03/31/2020IMPROVE NephelometerIMPNEP_ARS_20191001_20191231_R2020033110/01/19 - 12/31/1911497,152
03/31/2020IMPROVE NephelometerIMPNEP_ARS_20190701_20190930_R2019122407/01/19 - 09/30/1911497,152
10/22/2019IMPROVE AerosolINAPM25_UCD_Aug_Dec_2017_R2019102108/02/17 - 12/30/1715899856,686
10/17/2019IMPROVE AerosolINAPM25_UCD_Jan_Dec_2018_R2019100901/02/18 - 12/31/18159992,024,849
09/30/2019IMPROVE NephelometerIMPNEP_ARS_20190430_20190630_R2019092704/01/19 - 06/30/1911496,096
07/30/2019IMPROVE NephelometerIMPNEP_ARS_20190101_20190331_R2019062701/01/19 - 03/31/1911495,040
03/29/2019IMPROVE NephelometerIMPNEP_ARS_20181001_20181231_R2019032910/01/18 - 12/31/1811497,152
01/02/2019IMPROVE NephelometerIMPNEP_ARS_20180701_20180930_R2018122707/01/18 - 09/30/1811497,152
12/14/2018IMPROVE NephelometerIMPNEP_ARS_20180401_20180630_R2018092704/01/18 - 06/30/18124104,832
12/14/2018IMPROVE NephelometerIMPNEP_ARS_20180101_20180331_R2018062701/01/18 - 03/31/18124103,680
12/14/2018IMPROVE NephelometerIMPNEP_ARS_20171001_20171231_R2018032810/01/17 - 12/31/17124105,984
11/11/2018IMPROVE AerosolINAPM25_UCD_Dec_2017_R2018101512/03/17 - 12/30/1715799166,310
11/11/2018IMPROVE AerosolINAPM25_UCD_Jan_Dec_2017_R2018101201/01/17 - 12/31/17159992,042,243
04/06/2018IMPROVE RHR3 Group MeansIMPAERCALC_CIRA_2011_201704_P2018040501/03/11 - 04/28/17181101,394,970
03/30/2018IMPROVE AerosolINAPM25_UCD_201606_201609_Update_R2018031406/02/16 - 09/30/1615699669,943
03/30/2018IMPROVE AerosolINAPM25_UCD_201511_201701_Update_R2018030911/02/15 - 01/31/17163991,369,942
02/27/2018IMPROVE AerosolINAPM25_UCD_201508_201702_R2018022308/01/15 - 02/27/17168992,833,403
12/28/2017IMPROVE NephelometerIMPNEP_ARS_20170701_20170930_R2017122704/01/17 - 09/30/17124114,720
09/29/2017IMPROVE NephelometerIMPNEP_ARS_20170401_20170630_R2017092704/01/17 - 06/30/17124104,832
06/29/2017IMPROVE NephelometerIMPNEP_ARS_20170101_20170331_R2017062801/01/17 - 03/31/17124103,680
05/24/2017IMPROVE RHR3 Group MeansIMPAERCALC_ALL_2017052403/02/88 - 05/30/16226104,346,030
03/30/2017IMPROVE NephelometerIMPNEP_ARS_20161001_20161231_R2017033010/01/16 - 12/31/16124105,984
12/29/2016IMPROVE NephelometerIMPNEP_ARS_20160701_20160930_R2016122907/01/16 - 09/30/16124105,984
09/29/2016IMPROVE NephelometerIMPNEP_ARS_20160401_20160630_R2016092904/01/16 - 06/30/16154131,040
07/06/2016IMPROVE NephelometerIMPNEP_ARS_20160101_20160331_R2016062901/01/16 - 03/31/16154131,040
07/06/2016IMPROVE NephelometerIMPNEP_ARS_20151001_20151231_R2016032910/01/15 - 12/31/15154132,480
07/06/2016IMPROVE NephelometerIMPNEP_ARS_20150701_20150930_R2015122907/01/15 - 09/30/15154132,480
05/17/2016IMPROVE AerosolINAPM25_UCD_201507_20150907/02/15 - 09/30/1516751279,888
02/22/2016IMPROVE AerosolINAPM25_UCD_201504_201506_R2016021804/03/15 - 06/29/1516851273,513
02/22/2016IMPROVE AerosolINAPM25_UCD_201302_201503_R2016021802/03/13 - 03/31/15172512,420,919
10/05/2015IMPROVE NephelometerIMPNEP_ARS_20150401_20150630_R2015092804/01/15 - 06/30/15154131,040
09/17/2015IMPROVE AerosolINAPM25_UCD_FABS_2003_2004_R2015090901/03/03 - 12/29/04180512,249,865
07/07/2015IMPROVE NephelometerIMPNEP_ARS_20150101_20150331_R2015062901/01/15 - 03/31/15154129,600
05/05/2015IMPROVE AerosolINAPM25_UCD_200501_201405_Resubmission01/01/05 - 05/29/142005111,272,887
04/02/2015IMPROVE NephelometerIMPNEP_ARS_20141001_20141231_R2015033110/01/14 - 12/31/14154132,480
12/29/2014IMPROVE NephelometerIMPNEP_ARS_20140701_20140930_R2014122307/01/14 - 09/30/14154132,480
12/29/2014IMPROVE NephelometerIMPNEP_ARS_20140401_20140630_R2014092904/01/14 - 06/30/14154131,040
07/10/2014IMPROVE NephelometerIMPNEP_ARS_20140101_20140331_R2014062401/01/14 - 03/31/14154129,600
05/12/2014IMPROVE NephelometerIMPNEP_ARS_20131001_20131231_R2014032710/01/13 - 12/31/13154132,480
03/12/2014IMPROVE NephelometerIMPNEP_ARS_20130701_20130930_R2013122401/01/13 - 09/30/13164158,688
10/07/2013IMPROVE NephelometerIMPNEP_ARS_20130401_20130630_R2013092504/01/13 - 06/30/13164139,776
07/02/2013IMPROVE NephelometerIMPNEP_ARS_20130101_20130331_R2013062601/01/13 - 03/31/13164138,240
04/09/2013IMPROVE NephelometerIMPNEP_ARS_20121001_20121231_R2013032807/01/12 - 12/31/12174158,976
01/02/2013IMPROVE NephelometerIMPNEP_ARS_20120701_20120930_R2012123107/01/12 - 09/30/12164141,312
10/08/2012IMPROVE NephelometerIMPNEP_ARS_20120401_20120630_R2012092604/01/12 - 06/30/12174148,512
06/28/2012IMPROVE NephelometerIMPNEP_ARS_20120101_20120331_R2012062701/01/12 - 03/31/12174148,512
06/28/2012IMPROVE NephelometerIMPNEP_ARS_20111001_20111231_R2012032607/01/11 - 12/31/11174158,976
01/03/2012IMPROVE NephelometerIMPNEP_ARS_20110701_20110930_R2011122907/01/11 - 09/30/11164141,312
12/14/2011IMPROVE NephelometerIMPNEP_ARS_20110401_20110630_R2011062804/01/11 - 06/30/11164139,776
12/07/2011IMPROVE NephelometerIMPNEP_ARS_20110101_20110331_R2011033101/01/11 - 03/31/11164138,240
12/07/2011IMPROVE NephelometerIMPNEP_ARS_20101001_20101231_R2011033110/01/10 - 12/31/10164141,312
02/10/2011IMPROVE NephelometerIMPNEP_ARS_20100701_20100930_R2011021007/01/10 - 09/30/10184158,976
02/10/2011IMPROVE NephelometerIMPNEP_ARS_20100401_20100630_R2011021004/01/10 - 06/30/10274235,872
02/10/2011IMPROVE NephelometerIMPNEP_ARS_20100101_20100331_R2011021001/01/10 - 03/31/10274233,280
02/10/2011IMPROVE NephelometerIMPNEP_ARS_20091001_20091231_R2011021010/01/09 - 12/31/09274238,464
01/03/2011IMPROVE AerosolINAPM25_UCD_200901_20091201/01/09 - 12/30/09174511,209,261
04/13/2010IMPROVE NephelometerIMPNEP_ARS_20090101_20090331_R2009070101/01/09 - 03/31/09314267,840
04/13/2010IMPROVE NephelometerIMPNEP_ARS_20090401_20090630_R2010032204/01/09 - 06/30/09314270,816
04/13/2010IMPROVE NephelometerIMPNEP_ARS_20090701_20090930_R2010032207/01/09 - 09/30/09304264,960
11/23/2009IMPROVE AerosolINAPM25_UCD_2005_Resubmission_R2009112101/01/05 - 12/30/05179511,222,011
11/23/2009IMPROVE AerosolINAPM25_UCD_2006_Resubmission_R2009112101/02/06 - 12/31/06173511,204,518
11/23/2009IMPROVE AerosolINAPM25_UCD_2007_Resubmission_R2009112101/03/07 - 12/29/07172511,189,932
11/23/2009IMPROVE AerosolINAPM25_UCD_2008_Resubmission_R2009112101/01/08 - 12/29/08172511,205,079
04/20/2009IMPROVE NephelometerIMPNEP_ARS_20081001_20081231_R2009040610/01/08 - 12/31/08314273,792
01/16/2009IMPROVE NephelometerIMPNEP_ARS_20080701_20080930_R2009011407/01/08 - 09/30/08314273,792
09/30/2008IMPROVE NephelometerIMPNEP_ARS_20080401_20080630_R2008092904/01/08 - 06/30/08314270,816
09/30/2008IMPROVE NephelometerIMPNEP_ARS_20080101_20080331_R2008070101/01/08 - 03/31/08314270,816
04/15/2008IMPROVE AerosolIMPAER_UCD_FABS_88_99_R2007103103/02/88 - 02/26/0098172,680
04/09/2008IMPROVE NephelometerIMPNEP_ARS_20071001_20071231_R2008040810/01/97 - 12/31/07324343,488
01/02/2008IMPROVE NephelometerIMPNEP_ARS_20070701_20070930_R2007122007/01/07 - 09/30/07314273,792
10/09/2007IMPROVE NephelometerIMPNEP_ARS_20070401_20070630_R2007100904/01/07 - 06/30/07314270,816
08/31/2007IMPROVE NephelometerIMPNEP_ARS_20070101_20070331_R2007062701/01/07 - 03/31/07324276,480
07/17/2007IMPROVE NephelometerIMPNEP_ARS_20060101_20060331_R2006040101/01/06 - 03/31/06384328,320
07/17/2007IMPROVE NephelometerIMPNEP_ARS_20051001_20051231_R2006040110/01/05 - 12/31/05384335,616
05/01/2007IMPROVE NephelometerIMPNEP_ARS_20061001_20061231_R2007041210/01/06 - 12/31/06344300,288
10/06/2006IMPROVE AerosolIMPAER_UCD_200502_R2006100502/03/05 - 02/27/051734274,466
09/07/2005IMPROVE NephelometerIMPNEP_ARS_19930101_20050331_R2005090604/01/93 - 12/31/931426,400