CASTNet Dry Chemistry - Weekly Filter Pack Concentrations

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CASTNET is a national monitoring network established to assess trends in pollutant concentrations, atmospheric deposition, and ecological effects due to changes in air pollutant emissions. Filter pack data are reported for the time interval that the filter was exposed. Continuous measurements of gases (O3, SO2, NO, NOy, and CO) and meteorological parameters are reported as hourly averages. All data are reported in local standard time (i.e. times are not adjusted for daylight savings). Daily zero, span, and precision checks are reported for ozone and trace gases. For more information, visit the Clean Air Status and Trends (CASTNet) website.

Monitoring Site Locations:

Monitoring Site Metadata:

SiteCode	SiteName	CT	ST	EPACode	Lat	Lon	Elev	Start	End
ABT147	Abington	US	CT		41.84	-72.01	202	01/06/94	12/30/25
ACA416	Acadia NP	US	ME		44.38	-68.26	158	12/08/98	12/30/25
ALB801	Elk Island	CA	AB		53.68	-112.87		11/12/19	12/30/25
ALC188	Alabama-Coushatta Tribe of Texas	US	TX		30.7	-94.67	105	04/06/04	12/29/25
ALH157	Alhambra	US	IL		38.87	-89.62	164	07/05/88	12/06/22
ALH257	Alhambra Collocated	US	IL		38.87	-89.62	164	03/07/89	09/28/90
ANA115	Ann Arbor	US	MI		42.42	-83.9	266	07/05/88	05/10/22
ANL146	Argonne NL	US	IL		41.7	-87.99	229	07/21/87	04/06/93
ARE128	Arendtsville	US	PA		39.92	-77.31	266	07/05/88	12/30/25
ARE228	Arendtsville Collocated	US	PA		39.92	-77.31	266	10/02/90	05/02/95
ASH135	Ashland	US	ME		46.6	-68.41	231	01/03/89	05/10/22
ASH235	Ashland Collocated	US	ME		46.6	-68.41	231	09/12/95	07/31/01
BAS601	Basin	US	WY		44.28	-108.04	1242	11/13/12	04/14/25
BBE401	Big Bend NP	US	TX		29.3	-103.18	1052	08/01/95	12/30/25
BEL116	Beltsville	US	MD		39.03	-76.82	47	11/08/88	12/23/25
BFT142	Beaufort	US	NC		34.88	-76.62	5	01/10/94	12/31/25
BUF603	Buffalo	US	WY		44.14	-106.11	1324	11/13/12	04/15/25
BVL130	Bondville	US	IL		40.05	-88.37	213	02/16/88	12/16/25
BWR139	Blackwater NWR	US	MD		38.44	-76.11	1	07/11/95	12/30/25
CAD150	Caddo Valley	US	AR		34.18	-93.1	78	10/11/88	12/30/25
CAN407	Canyonlands NP	US	UT		38.46	-109.82	1809	02/01/95	12/30/25
CAT175	Claryville	US	NY		41.94	-74.55	754	05/17/94	09/02/25
CDR119	Cedar Creek	US	WV		38.88	-80.85	240	11/17/87	05/10/22
CDZ171	Cadiz	US	KY		36.78	-87.85	190	10/05/93	05/10/22
CHA267	Chiricahua NM Collocated	US	AZ		32.01	-109.39	1569	05/30/89	09/29/92
CHA467	Chiricahua NM	US	AZ		32.01	-109.39	1570	05/02/89	12/30/25
CHE185	Cherokee Nation	US	OK		35.75	-94.67	305	04/09/02	12/30/25
CKT136	Crockett	US	KY		37.92	-83.07	376	08/31/93	12/30/25
CND125	Candor	US	NC		35.26	-79.84	172	10/02/90	12/30/25
CNS011	Canaveral National Seashore	US	FL		28.64	-80.68	3	09/03/24	12/30/25
CNT169	Centennial	US	WY		41.36	-106.24	3175	05/16/89	12/30/25
CON186	Converse Station	US	CA		34.19	-116.91	1718	06/24/03	01/04/11
COW005	Coweeta Screwdriver Knob	US	NC		35.05	-83.45	960	11/24/14	08/16/16
COW137	Coweeta	US	NC		35.06	-83.43	683	11/10/87	12/30/25
CTH110	Connecticut Hill	US	NY		42.4	-76.65	511	10/06/87	12/30/25
CVL151	Coffeeville	US	MS		34	-89.8	138	01/03/89	12/30/25
DCP114	Deer Creek	US	OH		39.64	-83.26	264	10/04/88	05/10/22
DCP214	Deer Creek Collocated	US	OH		39.64	-83.26	264	11/13/90	09/24/92
DEN417	Denali NP	US	AK		63.72	-148.97	661	10/13/98	12/30/25
DEV412	Death Valley NM	US	CA		36.51	-116.85	125	02/28/95	01/08/08
DIN431	Dinosaur NM	US	UT		40.44	-109.3	1463	06/17/14	12/30/25
DUK008	Duke Forest	US	NC		35.97	-79.1	164	05/09/17	12/30/25
EGB181	Egbert	US	ON		44.23	-79.78	227	01/03/95	12/30/25
EGB281	Egbert Collocated	US	ON		44.23	-79.78	227	01/10/95	12/18/07
ESP127	Edgar Evins	US	TN		36.04	-85.73	302	03/29/88	12/30/25
EVE419	Everglades NP	US	FL		25.39	-80.68	2	10/13/98	12/30/25
FOR605	Fortification Creek	US	WY		44.34	-105.92	1408	05/07/13	04/15/25
GAS153	Georgia Station	US	GA		33.18	-84.41	265	07/05/88	12/30/25
GAS253	Georgia Station Collocated	US	GA		33.18	-84.41	265	02/07/89	09/09/90
GLR468	Glacier NP	US	MT		48.51	-114	976	01/03/89	12/30/25
GRB411	Great Basin NP	US	NV		39.01	-114.22	2060	05/23/95	12/31/25
GRC474	Grand Canyon NP	US	AZ		36.06	-112.18	2073	05/23/89	12/30/25
GRS420	Great Smoky NP - Look Rock	US	TN		35.63	-83.94	793	10/20/98	12/30/25
GTH161	Gothic	US	CO		38.96	-106.99	2915	05/23/89	12/30/25
HAS012	Haskell Indian Nations University	US	KS		38.93	-95.23	257	11/19/24	12/30/25
HOW132	Howland	US	ME		45.22	-68.71	66	12/01/92	10/30/12
HOW191	Howland Ameriflux	US	ME		45.2	-68.74	68	10/11/11	12/04/18
HOX148	Hoxeyville	US	MI		44.18	-85.74	297	11/07/00	12/30/25
HVT424	Hawaii Volcanoes NP	US	HI		19.42	-155.24	1199	08/10/99	07/17/04
HWF187	Huntington Wildlife Forest	US	NY		43.97	-74.22	497	06/04/02	05/10/22
IRL141	Indian River Lagoon	US	FL		27.85	-80.46	2	07/17/01	12/30/25
JOT403	Joshua Tree NP	US	CA		34.07	-116.39	1244	02/21/95	12/30/25
KEF112	Kane Exp. Forest	US	PA		41.6	-78.77	618	01/09/89	12/30/25
KIC003	Kickapoo Tribe of Indians of the Kickapoo Reser...	US	KS		39.85	-95.66	367	02/25/14	07/13/23
KNZ184	Konza Prairie	US	KS		39.1	-96.61	346	04/02/02	12/30/25
KVA428	Kobuk Valley NP	US	AK		67.09	-157.87	88	06/13/04	09/28/04
LAV410	Lassen Volcanic NP	US	CA		40.54	-121.58	1756	08/01/95	12/30/25
LCW121	Lilley C. Woods	US	KY		37.13	-82.99	335	01/26/88	12/28/93
LPO010	La Posta Band of Indians		CA	060739991	32.73	-116.36	1372	01/31/23	12/16/25
LRL117	Laurel Hill	US	PA		39.99	-79.25	609	12/22/87	12/30/25
LYE145	Lye Brook	US	VT		43.05	-73.06	725	04/06/94	02/13/07
LYK123	Lykens	US	OH		40.92	-83	303	01/17/89	10/12/10
MAC426	Mammoth Cave NP	US	KY		37.13	-86.14	243	07/30/02	12/30/25
MAR013	Martin County	US	FL		27.17	-80.22	10	10/21/25	12/29/25
MCK131	Mackville	US	KY		37.7	-85.05	293	08/07/90	12/30/25
MCK231	Mackville Collocated	US	KY		37.7	-85.05	293	01/05/93	12/30/25
MEV405	Mesa Verde NP	US	CO		37.2	-108.49	2165	01/17/95	12/30/25
MKG113	M.K. Goddard	US	PA		41.43	-80.15	377	01/19/88	12/30/25
MOR409	Mount Rainier NP	US	WA		46.76	-122.12	415	09/05/95	07/30/13
NCS415	North Cascades NP	US	WA		48.54	-121.45	109	02/20/96	01/02/08
NEC602	Newcastle	US	WY		43.87	-104.19	1468	11/13/12	04/15/25
NIC001	Nicks Lake	US	NY		43.68	-74.99	525	11/27/12	12/31/25
NPT006	Nez Perce Tribe	US	ID		46.28	-116.02	945	12/29/15	12/30/25
OLY421	Olympic NP	US	WA		48.1	-123.43	125	10/13/98	02/01/05
ONL102	Oak Ridge	US	TN		35.96	-84.29	341	01/13/87	12/27/88
OXF122	Oxford	US	OH		39.53	-84.72	284	08/25/87	12/30/25
PAL190	Palo Duro	US	TX		34.88	-101.66	1053	05/01/07	12/30/25
PAR107	Parsons	US	WV		39.09	-79.66	510	01/26/88	12/30/25
PAR207	Parsons Collocated	US	WV		39.09	-79.66	510	03/07/89	09/07/90
PBF129	Perryville	US	KY		37.68	-84.97	279	08/18/87	07/28/90
PED108	Prince Edward	US	VA		37.17	-78.31	149	11/10/87	12/30/25
PET427	Petrified Forest	US	AZ		34.82	-109.89	1723	09/24/02	01/02/24
PIN414	Pinnacles NM	US	CA		36.48	-121.16	335	05/23/95	12/30/25
PND165	Pinedale	US	WY		42.93	-109.79	2386	01/03/89	12/30/25
PNF126	Cranberry	US	NC		36.11	-82.05	1216	01/03/89	05/10/22
POF425	Poker Flats - Yukon Flats NM	US	AK		65.12	-147.43	495	07/14/98	02/04/04
PRK134	Perkinstown	US	WI		45.21	-90.6	462	10/04/88	12/30/25
PSU106	Penn State	US	PA		40.72	-77.93	364	01/13/87	05/10/22
QAK172	Quaker City	US	OH		39.94	-81.34	371	10/05/93	12/30/25
RCK163	Reynolds Creek	US	ID		43.21	-116.75	1198	06/06/89	09/28/93
RCK263	Reynolds Creek Collocated	US	ID		43.21	-116.75	1198	10/02/90	12/15/92
RED004	Red Lake Band of Chippewa Indians, Minnesota	US	MN		47.86	-94.84	372	09/02/14	12/30/25
ROM206	Rocky Mtn NP Collocated	US	CO		40.28	-105.55	2742	07/03/01	12/30/25
ROM406	Rocky Mtn NP	US	CO		40.28	-105.55	2743	01/03/95	12/30/25
RTP101	Res. Triangle Pk.	US	NC		35.91	-78.88	91	01/13/87	01/02/90
SAL133	Salamonie Reservoir	US	IN		40.82	-85.66	250	07/05/88	12/30/25
SAN189	Santee Sioux Nation, Nebraska	US	NE		42.83	-97.85	434	07/11/06	04/30/24
SAN192	Santee Sioux - Environmental Office	US	NE		42.75	-97.93	434	06/11/24	12/23/25
SAV164	Saval Ranch	US	NV		41.29	-115.86	1873	05/30/89	09/28/93
SEK402	Sequoia NP - Lookout Pt	US	CA		36.43	-118.76	1225	02/11/97	02/22/05
SEK430	Sequoia NP - Ash Mountain	US	CA		36.49	-118.83	510	04/12/05	12/31/25
SHE604	Sheridan	US	WY		44.93	-106.85	1115	11/13/12	04/14/25
SHN418	Shenandoah NP - Big Meadows	US	VA		38.52	-78.43	1073	07/06/88	12/30/25
SND152	Sand Mountain	US	AL		34.29	-85.97	349	01/03/89	12/30/25
SPD111	Speedwell	US	TN		36.47	-83.83	361	06/13/89	12/30/25
STK138	Stockton	US	IL		42.29	-90	281	01/04/94	12/30/25
SUM156	Sumatra	US	FL		30.11	-84.99	16	01/03/89	12/30/25
SUM256	Sumatra Collocated	US	FL		30.11	-84.99	16	11/13/90	03/04/93
THR422	Theodore Roosevelt NP	US	ND		46.89	-103.38	850	10/12/98	12/30/25
UIN162	Uinta	US	UT		40.55	-110.32	2500	05/09/89	09/28/93
UMA009	Confederated Tribes of the Umatilla Indian Rese...	US	WA		46.2	-117.95	681	11/10/20	12/30/25
UND002	Underhill	US	VT		44.53	-72.87	399	11/20/12	05/10/22
UVL124	Unionville	US	MI		43.61	-83.36	202	07/05/88	12/30/25
VII423	Virgin Islands NP - Lind Pt	US	VI		18.34	-64.8	80	10/13/98	01/20/04
VIN140	Vincennes	US	IN		38.74	-87.48	136	08/11/87	12/16/25
VOY413	Voyageurs NP	US	MN		48.41	-92.83	429	06/18/96	12/30/25
VPI120	Blue Grass Trail	US	VA		37.32	-80.46	652	06/09/87	12/30/25
WEL149	Wellston	US	MI		44.22	-85.82	295	07/05/88	08/04/98
WFM007	Whiteface Mountain Summit	US	NY		44.39	-73.86	1415	06/09/15	10/03/17
WFM105	Whiteface Mountain	US	NY		44.39	-73.86	570	01/13/87	12/30/25
WNC429	Wind Cave NP	US	SD		43.56	-103.48	1292	11/25/03	12/27/22
WPA103	West Point A	US	NY		41.35	-74.05	203	01/13/87	09/27/88
WPB104	West Point B	US	NY		41.35	-74.05	203	01/13/87	09/28/93
WSP144	Wash. Crossing	US	NJ		40.31	-74.87	59	01/03/89	12/30/25
WST109	Woodstock	US	NH		43.94	-71.7	255	01/03/89	12/30/25
YEL408	Yellowstone NP	US	WY		44.57	-110.4	2430	07/03/96	12/31/25
YOS404	Yosemite NP - Turtleback Dome	US	CA		37.71	-119.71	1605	10/03/95	12/30/25

Parameters Reported:

Code	Name	Units	from	SourceCode	SourceUnits
CAt	Calcium (Tsp)	µg/m^3	<--	CA	µg/m^3
CHLt	Chloride (Tsp)	µg/m^3	<--	CL	µg/m^3
FLOW_VOLUME	Flow Volume	L/min STP	<--	FLOW_VOLUME	L/min STP
Kt	Potassium (Tsp)	µg/m^3	<--	K	µg/m^3
MGt	Magnesium (Tsp)	µg/m^3	<--	MG	µg/m^3
NAt	Sodium (Tsp)	µg/m^3	<--	NA	µg/m^3
HNO3	Nitric Acid	µg/m^3	<--	NHNO3	µg/m^3
SO4_nylon	Sulfate from nylon	µg/m^3	<--	NSO4	µg/m^3
NH4t	Ammonium Ion (Tsp)	µg/m^3	<--	TNH4	µg/m^3
NO3t	Nitrate (Tsp)	µg/m^3	<--	TNO3	µg/m^3
NO3sum	Nitrate (total tsp & vapor)	µg/m^3	<--	TOTAL_NO3	µg/m^3
SO2	Sulfur Dioxide	µg/m^3	<--	TOTAL_SO2	µg/m^3
SO4t	Sulfate (Tsp)	µg/m^3	<--	TSO4	µg/m^3
VALID_HOURS	Valid hours during sampling period.	hrs	<--	VALID_HOURS	hrs
NO3_whatman	Nitrate from whatman	µg/m^3	<--	WNO3	µg/m^3
SO2_whatman	Sulfur dioxide from whatman	µg/m^3	<--	WSO2	µg/m^3

Data Flags:

FlagCode	Description	Category	SourceColumn	StatusFlag
!	X and U apply	Data Quality	%_F	V4
#	Both U and L flags apply	Data Quality	%_f	V6
$	L and U apply	Data Quality	%_F	V4
<	Invalid chemistry data and/or less than 75% valid flow data	Data Quality	%_F	I1
0	Level 0 validated data	Quality Assurance	QA_CODE	V0
1	Level 1 validated data	Quality Assurance	QA_CODE	V0
1X	Level 1 data that are suspect based on manual screening. Data should be omitted from any statistical analyses.	Quality Assurance	QA_CODE	I0
2	Level 2 validated data	Quality Assurance	QA_CODE	V0
3	Level 3 validated data	Quality Assurance	QA_CODE	V0
D	Dateon or dateoff questionable	Quality Assurance	qa_code	NA
GS	Government shutdown period	Quality Assurance	QA_CODE	I1
I	Invalid chemistry data and/or less than 75% valid flow data	Data Quality	%_f	I1
L	Less than 90% but greater than or equal to 75% valid flow data	Data Quality	%_f	V4
M	Missing or completely invalid flow data	Data Quality	%_f	I0
N	Sample not analyzed	Data Quality	%_f	I0
R	Re-run value used in calculation	Data Quality	%_f	V0
S	Both L and R flags apply	Data Quality	%_f	V6
U	Undetected - value listed is the reporting limit corrected by flow volume	Data Quality	%_f	V4
x	Data quality issue has been identified and will be resolved in future update	Quality Assurance	qa_code	V4