The NOAA/ESRL/GMD CCGG cooperative air sampling network effort began in 1967 at Niwot Ridge, Colorado. Today, the network is an international effort which includes regular discrete samples from the NOAA ESRL/GMD baseline observatories, cooperative fixed sites, and commercial ships. Air samples are collected approximately weekly from a globally distributed network of sites. Samples are analyzed for CO2, CH4, CO, H2, N2O, and SF6; and by INSTAAR for the stable isotopes of CO2 and CH4 and for many volatile organic compounds (voc) such as ethane (C2H6), ethylene (C2H4) and propane (C3H8). Measurement data are used to identify long-term trends, seasonal variability, and spatial distribution of carbon cycle gases.


Yellow symbols indicate discontinued sites


72 active sites in 36 countries
Code Name Country Latitude Longitude Elevation (meters) Time from GMT Cooperating Agency
ALT Alert, Nunavut Canada 82.451 -62.507 200.0 -4 hours Environment Canada
AMT Argyle, Maine United States 45.035 -68.682 53.0 -5 hours University of Maine
AMY Anmyeon-do Republic of Korea 36.539 126.329 47.0 +9 hours Korea Global Atmosphere Watch Center, Korea Meteorological Administration
ASC Ascension Island United Kingdom -7.967 -14.400 85.0 -1 hours Met Office (United Kingdom)
ASK Assekrem Algeria 23.262 5.632 2710.0 +1 hours Office National de la Meteorologie
AZR Terceira Island, Azores Portugal 38.766 -27.375 19.0 -1 hours Instituto Nacional de Meteorologia e Geofisica
BHD Baring Head Station New Zealand -41.408 174.871 85.0 +12 hours National Institute of Water and Atmospheric Research
BKT Bukit Kototabang Indonesia -0.202 100.318 845.0 +7 hours Bureau of Meteorology and Geophysics
BMW Tudor Hill, Bermuda United Kingdom 32.265 -64.879 30.0 -4 hours Bermuda Institute of Ocean Sciences
BRW Barrow Atmospheric Baseline Observatory United States 71.323 -156.611 11.0 -9 hours NOAA Earth System Research Laboratory, Global Monitoring Division
BWD Brentwood, Maryland United States 38.934 -76.956 16.8 -5 hours NIST and Earth Networks
CBA Cold Bay, Alaska United States 55.210 -162.720 21.3 -9 hours U.S. National Weather Service
CGO Cape Grim, Tasmania Australia -40.683 144.690 94.0 +10 hours CSIRO, Atmospheric Research
CHR Christmas Island Republic of Kiribati 1.700 -157.152 0.0 -10 hours Dive Kiribati
CIB Centro de Investigacion de la Baja Atmosfera (CIBA) Spain 41.810 -4.930 845.0 +1 hours Centro de Investigacion de la Baja Atmosfera, Univ. of Valladolid
CPT Cape Point South Africa -34.352 18.489 230.0 +2 hours South African Weather Service
CRV Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE) United States 64.986 -147.598 611.4 -8 hours NASA Terrestrial Ecology Program; NOAA/NESDIS/OSPO/FCDAS
CRZ Crozet Island France -46.434 51.848 197.0 +5 hours Centre des Faibles Radioactivities/TAAF
DRP Drake Passage N/A -59.000 -64.690 0.0 -4 hours National Science Foundation
DSI Dongsha Island Taiwan 20.699 116.730 3.0 +8 hours National Central University, Taiwan
EIC Easter Island Chile -27.160 -109.428 47.0 -7 hours Direccion Meteorologica de Chile
GMI Mariana Islands Guam 13.386 144.656 0.0 +10 hours University of Guam/Marine Laboratory
HBA Halley Station, Antarctica United Kingdom -75.605 -26.210 30.0 -2 hours British Antarctic Survey
HPB Hohenpeissenberg Germany 47.801 11.024 936.0 +1 hours Deutscher Wetterdienst
HUN Hegyhatsal Hungary 46.950 16.650 248.0 +1 hours Hungarian Meteorological Service
ICE Storhofdi, Vestmannaeyjar Iceland 63.400 -20.288 118.0 +0 hours Icelandic Meteorological Office
INX INFLUX (Indianapolis Flux Experiment) United States 39.581 -86.421 -9999.99 -5 hours Purdue University
IZO Izana, Tenerife, Canary Islands Spain 28.309 -16.499 2372.9 +0 hours Izana Observatory/Meteorological State Agency of Spain
KEY Key Biscayne, Florida United States 25.665 -80.158 1.0 -5 hours NOAA Atlantic Oceanographic and Meteorological Laboratory
KUM Cape Kumukahi, Hawaii United States 19.737 -155.012 0.3 -10 hours NOAA Earth System Research Laboratory, Global Monitoring Division
LEF Park Falls, Wisconsin United States 45.945 -90.273 472.0 -6 hours Wisconsin Educational Communications Board & US Forest Service; MBMAS; USDA Forest Service Forestry Sciences Laboratory; USDA Forest Service
LEW Lewisburg, Pennsylvania United States 40.945 -76.879 161.0 -5 hours Earth Networks, Inc.
LLN Lulin Taiwan 23.470 120.870 2862.0 +8 hours Lulin Atmospheric Background Station
LMP Lampedusa Italy 35.520 12.620 45.0 +1 hours Ente per le Nuove tecnologie, l’Energia e l’Ambiente
MBO Mt. Bachelor Observatory United States 43.977 -121.686 2731.0 -8 hours University of Washington
MEX High Altitude Global Climate Observation Center Mexico 18.984 -97.311 4464.0 -6 hours Sistema Internacional de Monitoreo Ambiental
MHD Mace Head, County Galway Ireland 53.326 -9.899 5.0 +0 hours National University of Ireland, Galway
MID Sand Island, Midway United States 28.210 -177.380 11.0 -11 hours U.S. Fish and Wildlife Service
MLO Mauna Loa, Hawaii United States 19.536 -155.576 3397.0 -10 hours NOAA Earth System Research Laboratory, Global Monitoring Division
MRC Marcellus Pennsylvania United States 41.466 -76.419 592.0 -5 hours Penn State University
MSH Mashpee, Massachusetts United States 41.657 -70.497 32.3 -5 hours Earth Networks
MWO Mt. Wilson Observatory United States 34.225 -118.059 1728.0 -8 hours UCLA Astrophysics/Solar Observatory
NAT Farol De Mae Luiza Lighthouse Brazil -5.795 -35.185 50.0 -3 hours Instituto de Pesquisas Energéticas e Nucleares, Il Centro de Química e Meio Ambiente, Divisao de Quimica Ambiental
NEB NE Baltimore, Maryland United States 39.315 -76.583 44.0 -5 hours NIST and Earth Networks
NMB Gobabeb Namibia -23.580 15.030 456.0 +1 hours Gobabeb Training and Research Center
NWB NW Baltimore United States 39.344 -76.685 135.0 -5 hours NIST and Earth Networks
NWR Niwot Ridge, Colorado United States 40.053 -105.586 3523.0 -7 hours University of Colorado/INSTAAR
OXK Ochsenkopf Germany 50.030 11.808 1022.0 +1 hours Max Planck Institute for Biogeochemistry
PAL Pallas-Sammaltunturi, GAW Station Finland 67.973 24.116 565.0 +2 hours Finnish Meteorological Institute
PSA Palmer Station, Antarctica United States -64.920 -64.000 10.0 -3 hours National Science Foundation
RPB Ragged Point Barbados 13.165 -59.432 15.0 -4 hours Private Party
SCT Beech Island, South Carolina United States 33.406 -81.833 115.2 -5 hours Savannah River National Laboratory, DOE; Savannah River National Laboratory and University of Georgia
SEY Mahe Island Seychelles -4.682 55.532 2.0 +4 hours Seychelles Bureau of Standards
SGP Southern Great Plains, Oklahoma United States 36.607 -97.489 314.0 -6 hours Lawrence Berkeley National Laboratory
SHM Shemya Island, Alaska United States 52.711 174.126 23.0 -10 hours Chugach McKinley
SMO Tutuila American Samoa -14.247 -170.564 42.0 -11 hours NOAA Earth System Research Laboratory, Global Monitoring Division
SPO South Pole, Antarctica United States -89.980 -24.800 2810.0 +12 hours National Science Foundation
STR Sutro Tower, San Francisco, California United States 37.755 -122.452 254.0 -8 hours Lawrence Berkeley National Laboratory
SUM Summit Greenland 72.596 -38.422 3209.5 -2 hours National Science Foundation Office of Polar Programs
SYO Syowa Station, Antarctica Japan -69.013 39.590 14.0 +3 hours National Institute of Polar Research
TAP Tae-ahn Peninsula Republic of Korea 36.738 126.133 16.0 +9 hours Korea Centre for Atmospheric Environment Research
TMD Thurmont, Maryland United States 39.577 -77.488 561.0 -5 hours NIST and Earth Networks
TPI Taiping Island Taiwan 10.379 114.371 4.0 +8 hours
USH Ushuaia Argentina -54.848 -68.311 12.0 -4 hours Servicio Meteorologico Nacional
UTA Wendover, Utah United States 39.902 -113.718 1327.0 -7 hours Beth Anderson/ NWS Cooperative Observer
UUM Ulaan Uul Mongolia 44.452 111.096 1007.0 +8 hours Mongolian Hydrometeorological Research Institute
WBI West Branch, Iowa United States 41.725 -91.353 241.7 -6 hours M & M Aviation Services, Ltd.; University of Iowa
WGC Walnut Grove, California United States 38.265 -121.491 0.0 -8 hours Lawrence Berkeley National Laboratory; DOE Environmental Energy Technologies Division at Lawrence Berkeley National Laboratory; KalScott Engineering
WIS Weizmann Institute of Science at the Arava Institute, Ketura Israel 29.965 35.060 151.0 +2 hours Weizmann Institute of Science and Arava Institute for Environmental Studies
WKT Moody, Texas United States 31.315 -97.327 251.0 -6 hours Blackland Research and Extension Center-Texas Agricultural Experiment Station; Pinnacle Towers Inc.
WLG Mt. Waliguan Peoples Republic of China 36.288 100.896 3810.0 +8 hours Chinese Academy of Meteorological Sciences (CAMS) and Qinghai Meteorological Bureau (QMB), China Meteorological Administration (CMA)
ZEP Ny-Alesund, Svalbard Norway and Sweden 78.907 11.888 474.0 +1 hours Zeppelin Station/University of Stockholm Meteorological Institute