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.
SiteCodeSiteNameCTSTEPACodeLatLonElevStartEnd
ABT147AbingtonUSCT 41.84-72.0120201/06/9411/24/20
ACA416Acadia NPUSME 44.38-68.2615812/08/9811/24/20
ALC188Alabama-Coushatta Tribe of TexasUSTX 30.7-94.6710504/06/0411/25/20
ALH157AlhambraUSIL 38.87-89.6216407/05/8811/24/20
ALH257Alhambra CollocatedUSIL 38.87-89.6216403/07/8909/28/90
ANA115Ann ArborUSMI 42.42-83.926607/05/8811/24/20
ANL146Argonne NLUSIL 41.7-87.9922907/21/8704/06/93
ARE128ArendtsvilleUSPA 39.92-77.3126607/05/8811/24/20
ARE228Arendtsville CollocatedUSPA 39.92-77.3126610/02/9005/02/95
ASH135AshlandUSME 46.6-68.4123101/03/8911/24/20
ASH235Ashland CollocatedUSME 46.6-68.4123109/12/9507/31/01
BAS601BasinUSWY 44.28-108.04124211/13/1211/24/20
BBE401Big Bend NPUSTX 29.3-103.18105208/01/9511/24/20
BEL116BeltsvilleUSMD 39.03-76.824711/08/8811/24/20
BFT142BeaufortUSNC 34.88-76.62501/10/9411/24/20
BUF603BuffaloUSWY 44.14-106.11132411/13/1211/24/20
BVL130BondvilleUSIL 40.05-88.3721302/16/8811/24/20
BWR139Blackwater NWRUSMD 38.44-76.11107/11/9511/24/20
CAD150Caddo ValleyUSAR 34.18-93.17810/11/8811/24/20
CAN407Canyonlands NPUSUT 38.46-109.82180902/01/9511/24/20
CAT175ClaryvilleUSNY 41.94-74.5575405/17/9411/24/20
CDR119Cedar CreekUSWV 38.88-80.8524011/17/8711/24/20
CDZ171CadizUSKY 36.78-87.8519010/05/9311/24/20
CHA267Chiricahua NM CollocatedUSAZ 32.01-109.39156905/30/8909/29/92
CHA467Chiricahua NMUSAZ 32.01-109.39157005/02/8911/24/20
CHE185Cherokee NationUSOK 35.75-94.6730504/09/0211/24/20
CKT136CrockettUSKY 37.92-83.0737608/31/9311/23/20
CND125CandorUSNC 35.26-79.8417210/02/9011/24/20
CNT169CentennialUSWY 41.36-106.24317505/16/8911/24/20
CON186Converse StationUSCA 34.19-116.91171806/24/0301/04/11
COW005Coweeta Screwdriver KnobUSNC 35.05-83.4596011/24/1408/16/16
COW137CoweetaUSNC 35.06-83.4368311/10/8711/24/20
CTH110Connecticut HillUSNY 42.4-76.6551110/06/8711/24/20
CVL151CoffeevilleUSMS 34-89.813801/03/8911/24/20
DCP114Deer CreekUSOH 39.64-83.2626410/04/8811/24/20
DCP214Deer Creek CollocatedUSOH 39.64-83.2626411/13/9009/24/92
DEN417Denali NPUSAK 63.72-148.9766110/13/9811/24/20
DEV412Death Valley NMUSCA 36.51-116.8512502/28/9501/08/08
DIN431Dinosaur NMUSUT 40.44-109.3146306/17/1411/24/20
DUK008Duke ForestUSNC 35.97-79.116405/09/1711/17/20
EGB181EgbertUSON 44.23-79.7822701/03/9511/24/20
EGB281Egbert CollocatedUSON 44.23-79.7822701/10/9512/18/07
ESP127Edgar EvinsUSTN 36.04-85.7330203/29/8811/24/20
EVE419Everglades NPUSFL 25.39-80.68210/13/9811/24/20
FOR605Fortification CreekUSWY 44.34-105.92140805/07/1311/24/20
GAS153Georgia StationUSGA 33.18-84.4126507/05/8811/24/20
GAS253Georgia Station CollocatedUSGA 33.18-84.4126502/07/8909/09/90
GLR468Glacier NPUSMT 48.51-11497601/03/8911/24/20
GRB411Great Basin NPUSNV 39.01-114.22206005/23/9511/24/20
GRC474Grand Canyon NPUSAZ 36.06-112.18207305/23/8911/17/20
GRS420Great Smoky NP - Look RockUSTN 35.63-83.9479310/20/9811/24/20
GTH161GothicUSCO 38.96-106.99291505/23/8911/17/20
HOW132HowlandUSME 45.22-68.716612/01/9210/30/12
HOW191Howland AmerifluxUSME 45.2-68.746810/11/1112/04/18
HOX148HoxeyvilleUSMI 44.18-85.7429711/07/0011/24/20
HVT424Hawaii Volcanoes NPUSHI 19.42-155.24119908/10/9907/17/04
HWF187Huntington Wildlife ForestUSNY 43.97-74.2249706/04/0211/24/20
IRL141Indian River LagoonUSFL 27.85-80.46207/17/0111/24/20
JOT403Joshua Tree NPUSCA 34.07-116.39124402/21/9511/24/20
KEF112Kane Exp. ForestUSPA 41.6-78.7761801/09/8911/24/20
KIC003Kickapoo Tribe of Indians of the Kickapoo Reser...USKS 39.85-95.6636702/25/1411/24/20
KNZ184Konza PrairieUSKS 39.1-96.6134604/02/0211/30/20
KVA428Kobuk Valley NPUSAK 67.09-157.878806/13/0409/28/04
LAV410Lassen Volcanic NPUSCA 40.54-121.58175608/01/9511/16/20
LCW121Lilley C. WoodsUSKY 37.13-82.9933501/26/8812/28/93
LRL117Laurel HillUSPA 39.99-79.2560912/22/8711/24/20
LYE145Lye BrookUSVT 43.05-73.0672504/06/9402/13/07
LYK123LykensUSOH 40.92-8330301/17/8910/12/10
MAC426Mammoth Cave NPUSKY 37.13-86.1424307/30/0211/24/20
MCK131MackvilleUSKY 37.7-85.0529308/07/9011/24/20
MCK231Mackville CollocatedUSKY 37.7-85.0529301/05/9311/24/20
MEV405Mesa Verde NPUSCO 37.2-108.49216501/17/9511/24/20
MKG113M.K. GoddardUSPA 41.43-80.1537701/19/8811/24/20
MOR409Mount Rainier NPUSWA 46.76-122.1241509/05/9507/30/13
NCS415North Cascades NPUSWA 48.54-121.4510902/20/9601/02/08
NEC602NewcastleUSWY 43.87-104.19146811/13/1211/24/20
NIC001Nicks LakeUSNY 43.68-74.9952511/27/1211/25/20
NPT006Nez Perce TribeUSID 46.28-116.0294512/29/1511/24/20
OLY421Olympic NPUSWA 48.1-123.4312510/13/9802/01/05
ONL102Oak RidgeUSTN 35.96-84.2934101/13/8712/27/88
OXF122OxfordUSOH 39.53-84.7228408/25/8711/24/20
PAL190Palo DuroUSTX 34.88-101.66105305/01/0711/24/20
PAR107ParsonsUSWV 39.09-79.6651001/26/8811/24/20
PAR207Parsons CollocatedUSWV 39.09-79.6651003/07/8909/07/90
PBF129PerryvilleUSKY 37.68-84.9727908/18/8707/28/90
PED108Prince EdwardUSVA 37.17-78.3114911/10/8711/24/20
PET427Petrified ForestUSAZ 34.82-109.89172309/24/0211/24/20
PIN414Pinnacles NMUSCA 36.48-121.1633505/23/9511/24/20
PND165PinedaleUSWY 42.93-109.79238601/03/8911/17/20
PNF126CranberryUSNC 36.11-82.05121601/03/8911/24/20
POF425Poker Flats - Yukon Flats NMUSAK 65.12-147.4349507/14/9802/04/04
PRK134PerkinstownUSWI 45.21-90.646210/04/8811/24/20
PSU106Penn StateUSPA 40.72-77.9336401/13/8711/24/20
QAK172Quaker CityUSOH 39.94-81.3437110/05/9311/24/20
RCK163Reynolds CreekUSID 43.21-116.75119806/06/8909/28/93
RCK263Reynolds Creek CollocatedUSID 43.21-116.75119810/02/9012/15/92
RED004Red Lake Band of Chippewa Indians, MinnesotaUSMN 47.86-94.8437209/02/1411/24/20
ROM206Rocky Mtn NP CollocatedUSCO 40.28-105.55274207/10/0111/24/20
ROM406Rocky Mtn NPUSCO 40.28-105.55274301/03/9511/24/20
RTP101Res. Triangle Pk.USNC 35.91-78.889101/13/8701/02/90
SAL133Salamonie ReservoirUSIN 40.82-85.6625007/05/8811/24/20
SAN189Santee Sioux Nation, NebraskaUSNE 42.83-97.8543407/11/0611/24/20
SAV164Saval RanchUSNV 41.29-115.86187305/30/8909/28/93
SEK402Sequoia NP - Lookout PtUSCA 36.43-118.76122502/11/9702/22/05
SEK430Sequoia NP - Ash MountainUSCA 36.49-118.8351004/12/0511/24/20
SHE604SheridanUSWY 44.93-106.85111511/13/1211/24/20
SHN418Shenandoah NP - Big MeadowsUSVA 38.52-78.43107307/06/8811/24/20
SND152Sand MountainUSAL 34.29-85.9734901/03/8911/24/20
SPD111SpeedwellUSTN 36.47-83.8336106/13/8911/24/20
STK138StocktonUSIL 42.29-9028101/04/9411/24/20
SUM156SumatraUSFL 30.11-84.991601/03/8911/24/20
SUM256Sumatra CollocatedUSFL 30.11-84.991611/13/9003/04/93
THR422Theodore Roosevelt NPUSND 46.89-103.3885010/12/9811/24/20
UIN162UintaUSUT 40.55-110.32250005/09/8909/28/93
UMA009Confederated Tribes of the Umatilla Indian Rese...USWA 46.2-117.9568111/10/2011/23/20
UND002UnderhillUSVT 44.53-72.8739911/20/1211/24/20
UVL124UnionvilleUSMI 43.61-83.3620207/05/8811/24/20
VII423Virgin Islands NP - Lind PtUSVI 18.34-64.88010/13/9801/20/04
VIN140VincennesUSIN 38.74-87.4813608/11/8711/24/20
VOY413Voyageurs NPUSMN 48.41-92.8342906/18/9611/24/20
VPI120Blue Grass TrailUSVA 37.32-80.4665206/09/8711/24/20
WEL149WellstonUSMI 44.22-85.8229507/05/8808/04/98
WFM007Whiteface Mountain SummitUSNY 44.39-73.86141506/09/1510/03/17
WFM105Whiteface MountainUSNY 44.39-73.8657001/13/8711/24/20
WNC429Wind Cave NPUSSD 43.56-103.48129211/25/0311/24/20
WPA103West Point AUSNY 41.35-74.0520301/13/8709/27/88
WPB104West Point BUSNY 41.35-74.0520301/13/8709/28/93
WSP144Wash. CrossingUSNJ 40.31-74.875901/03/8911/24/20
WST109WoodstockUSNH 43.94-71.725501/03/8911/24/20
YEL408Yellowstone NPUSWY 44.57-110.4243007/03/9611/30/20
YOS404Yosemite NP - Turtleback DomeUSCA 37.71-119.71160510/03/9511/24/20
CodeNameUnitsfromSourceCodeSourceUnits
CAtCalcium (Tsp)µg/m^3<--CAµg/m^3
CHLtChloride (Tsp)µg/m^3<--CLµg/m^3
FLOW_VOLUMEFlow VolumeL/min STP<--FLOW_VOLUMEL/min STP
KtPotassium (Tsp)µg/m^3<--Kµg/m^3
MGtMagnesium (Tsp)µg/m^3<--MGµg/m^3
NAtSodium (Tsp)µg/m^3<--NAµg/m^3
HNO3Nitric Acidµg/m^3<--NHNO3µg/m^3
SO4_nylonSulfate from nylonµg/m^3<--NSO4µg/m^3
NH4tAmmonium Ion (Tsp)µg/m^3<--TNH4µg/m^3
NO3tNitrate (Tsp)µg/m^3<--TNO3µg/m^3
NO3sumNitrate (total tsp & vapor)µg/m^3<--TOTAL_NO3µg/m^3
SO2Sulfur Dioxideµg/m^3<--TOTAL_SO2µg/m^3
SO4tSulfate (Tsp)µg/m^3<--TSO4µg/m^3
VALID_HOURSValid hours during sampling period.hrs<--VALID_HOURShrs
NO3_whatmanNitrate from whatmanµg/m^3<--WNO3µg/m^3
SO2_whatmanSulfur dioxide from whatmanµg/m^3<--WSO2µg/m^3