| CODE | NAME | LAT | LON | ALT3 (masl1) | # OF SAMPLES | FIRST | LAST | STATUS | | ABP | Arembepe, Bahia, Brazil | -12.7700 | -38.1700 | 6 | 95 | 2006-10-27 | 2009-08-10 | Ongoing |
| ALT | Alert, Nunavut, Canada | 82.4508 | -62.5056 | 210 | 1196 | 1985-06-10 | 2009-08-12 | Ongoing |
| AMS | Amsterdam Island, France | -37.9500 | 77.5300 | 150 | 756 | 1982-03-04 | 1990-11-12 | Terminated |
| AMT | Argyle, Maine, United States | 45.0300 | -68.6800 | 157 | 271 | 2003-09-18 | 2008-12-21 | Terminated |
| AMT | Argyle, Maine, United States | 45.0300 | -68.6800 | 157 | 220 | 2008-11-23 | 2009-10-08 | Ongoing |
| AOC | Atlantic Ocean Cruise, N/A | Variable | Variable | 10 | 114 | 2004-05-14 | 2005-02-21 | Terminated |
| ASC | Ascension Island, United Kingdom | -7.9200 | -14.4200 | 54 | 2804 | 1979-08-27 | 2009-10-08 | Ongoing |
| ASK | Assekrem, Algeria | 23.1800 | 5.4200 | 2728 | 546 | 1995-09-12 | 2009-09-27 | Ongoing |
| AVI | St. Croix, Virgin Islands, United States | 17.7500 | -64.7500 | 3 | 1039 | 1979-03-03 | 1990-08-29 | Terminated |
| AZR | Terceira Island, Azores, Portugal | 38.7700 | -27.3800 | 40 | 1096 | 1979-12-31 | 2009-06-04 | Ongoing |
| BAL | Baltic Sea, Poland | 55.3500 | 17.2200 | 28 | 1587 | 1992-08-31 | 2009-09-17 | Ongoing |
| BAO | Boulder Atmospheric Observatory, Colorado, United States | 40.0500 | -105.0040 | 1884 | 623 | 2007-08-16 | 2009-10-26 | Ongoing |
| BKT | Bukit Kototabang, Indonesia | -0.2020 | 100.3180 | 864.5 | 284 | 2004-01-08 | 2009-09-15 | Ongoing |
| BME | St. Davids Head, Bermuda, United Kingdom | 32.3700 | -64.6500 | 30 | 771 | 1989-02-13 | 2009-07-28 | Ongoing |
| BMW | Tudor Hill, Bermuda, United Kingdom | 32.2700 | -64.8800 | 30 | 767 | 1989-05-18 | 2009-09-28 | Ongoing |
| BRW | Barrow, Alaska, United States | 71.3230 | -156.6114 | 11 | 1906 | 1971-05-03 | 2009-10-19 | Ongoing |
| BSC | Black Sea, Constanta, Romania | 44.1700 | 28.6800 | 3 | 743 | 1994-10-19 | 2009-08-24 | Ongoing |
| CBA | Cold Bay, Alaska, United States | 55.2100 | -162.7200 | 56.34 | 2800 | 1978-10-11 | 2009-10-16 | Ongoing |
| CGO | Cape Grim, Tasmania, Australia | -40.6830 | 144.6900 | 164 | 977 | 1984-04-19 | 2009-07-27 | Ongoing |
| CHR | Christmas Island, Republic of Kiribati | 1.7000 | -157.1700 | 3 | 898 | 1984-03-08 | 2009-06-22 | Ongoing |
| CIB | Centro de Investigación de la Baja Atmósfera (CIBA), Spain | 41.8100 | -4.9300 | 850 | 24 | 2009-05-05 | 2009-10-13 | Ongoing |
| CMO | Cape Meares, Oregon, United States | 45.4800 | -123.9700 | 30 | 709 | 1982-03-10 | 1997-12-30 | Terminated |
| CRZ | Crozet Island, France | -46.4500 | 51.8500 | 120 | 654 | 1991-03-25 | 2009-08-13 | Ongoing |
| DRP | Drake Passage, N/A | -59.0000 | -64.6900 | 10 | 100 | 2003-04-07 | 2009-06-29 | Ongoing |
| EIC | Easter Island, Chile | -27.1500 | -109.4500 | 50 | 576 | 1994-01-04 | 2009-07-28 | Ongoing |
| GMI | Mariana Islands, Guam | 13.4300 | 144.7800 | 6 | 2530 | 1978-09-24 | 2009-10-14 | Ongoing |
| GOZ | Dwejra Point, Gozo, Malta | 36.0500 | 14.1800 | 30 | 158 | 1993-10-11 | 1999-02-12 | Terminated |
| HBA | Halley Station, Antarctica, United Kingdom | -75.5800 | -26.5000 | 33 | 965 | 1983-01-17 | 2008-12-31 | Ongoing |
| HPB | Hohenpeissenberg, Germany | 47.8000 | 11.0100 | 990 | 180 | 2006-04-06 | 2009-09-28 | Ongoing |
| HSU | Humboldt State University, United States | 41.0588 | -124.7500 | 7 | 10 | 2008-05-17 | 2009-09-14 | Ongoing |
| HUN | Hegyhatsal, Hungary | 46.9500 | 16.6500 | 344 | 827 | 1993-03-02 | 2009-08-12 | Ongoing |
| ICE | Storhofdi, Vestmannaeyjar, Iceland | 63.3998 | -20.2884 | 127 | 727 | 1992-10-02 | 2009-09-14 | Ongoing |
| ITN | Grifton, North Carolina, United States | 35.3500 | -77.3800 | 505 | 359 | 1992-07-30 | 1999-06-09 | Terminated |
| IZO | Tenerife, Canary Islands, Spain | 28.3090 | -16.4990 | 2360 | 733 | 1991-11-16 | 2009-06-24 | Ongoing |
| KCO | Kaashidhoo, Republic of Maldives | 4.9700 | 73.4700 | 1 | 45 | 1998-03-02 | 1999-07-11 | Terminated |
| KEY | Key Biscayne, Florida, United States | 25.6654 | -80.1580 | 3 | 1369 | 1972-12-13 | 2009-09-29 | Ongoing |
| KUM | Cape Kumukahi, Hawaii, United States | 19.5200 | -154.8200 | 3 | 1752 | 1976-03-09 | 2009-10-15 | Ongoing |
| KZD | Sary Taukum, Kazakhstan | 44.0839 | 76.8712 | 601 | 574 | 1997-10-12 | 2009-08-08 | Ongoing |
| KZM | Plateau Assy, Kazakhstan | 43.2500 | 77.8800 | 2519 | 572 | 1997-10-15 | 2009-08-05 | Ongoing |
| LEF | Park Falls, Wisconsin, United States | 45.9451 | -90.2732 | 868 | 1032 | 2006-10-07 | 2009-10-19 | Ongoing |
| LEF | Park Falls, Wisconsin, United States | 45.9451 | -90.2732 | 868 | 740 | 1994-12-06 | 2009-10-14 | Ongoing |
| LLB | Lac La Biche, Alberta, Canada | 54.9500 | -112.4500 | 588 | 108 | 2008-01-30 | 2009-07-31 | Ongoing |
| LLN | Lulin, Taiwan | 23.4700 | 120.8700 | 2867 | 162 | 2006-08-08 | 2009-10-20 | Ongoing |
| LMP | Lampedusa, Italy | 35.5200 | 12.6200 | 50 | 152 | 2006-10-12 | 2009-09-24 | Ongoing |
| MBC | Mould Bay, Nunavut, Canada | 76.2500 | -119.3500 | 58 | 1543 | 1980-04-13 | 1997-05-26 | Terminated |
| MCM | McMurdo Station, Antarctica, United States | -77.8300 | 166.6000 | 11 | 46 | 1985-12-04 | 1987-10-28 | Terminated |
| MEX | Mex High Altitude Global Climate Observation Center, Mexico | 19.9800 | -97.1700 | 4565 | 34 | 2009-01-09 | 2009-10-08 | Ongoing |
| MHD | Mace Head, County Galway, Ireland | 53.3260 | -9.8990 | 25 | 862 | 1991-06-03 | 2009-06-05 | Ongoing |
| MID | Sand Island, Midway, United States | 28.2100 | -177.3800 | 7.7 | 1245 | 1985-05-03 | 2009-09-21 | Ongoing |
| MKN | Mt. Kenya, Kenya | -0.0500 | 37.3000 | 3897 | 104 | 2003-12-23 | 2009-08-15 | Ongoing |
| MLO | Mauna Loa, Hawaii, United States | 19.5362 | -155.5763 | 3397 | 1773 | 1969-08-20 | 2009-10-20 | Ongoing |
| MVY | Marthas Vineyard, Massachusetts, United States | 41.3300 | -70.5200 | 12 | 62 | 2007-04-27 | 2009-08-12 | Ongoing |
| NMB | Gobabeb, Namibia | -23.5800 | 15.0300 | 461 | 178 | 1997-01-13 | 2009-10-07 | Ongoing |
| NWF | Niwot Ridge Forest, Colorado, United States | 40.0300 | -105.5500 | Variable | 485 | 2006-01-20 | 2009-10-03 | Ongoing |
| NWR | Niwot Ridge, Colorado, United States | 40.0500 | -105.5800 | 3526 | 587 | 2005-09-16 | 2009-10-15 | Ongoing |
| NWR | Niwot Ridge, Colorado, United States | 40.0500 | -105.5800 | 3526 | 1970 | 1968-01-16 | 2009-10-20 | Ongoing |
| OBN | Obninsk, Russia | 55.1100 | 36.6000 | 484 | 160 | 2004-01-06 | 2008-05-29 | Ongoing |
| OPW | Olympic Peninsula, Washington, United States | 48.2500 | -124.4200 | 488 | 101 | 1984-11-06 | 1990-05-30 | Terminated |
| OXK | Ochsenkopf, Germany | 50.0300 | 11.8000 | 1185 | 162 | 2003-03-13 | 2009-09-23 | Ongoing |
| PAL | Pallas-Sammaltunturi, GAW Station, Finland | 67.9700 | 24.1200 | 560 | 324 | 2001-12-21 | 2009-09-18 | Ongoing |
| POC | Pacific Ocean, N/A | Variable | Variable | 10 | 4578 | 1986-12-14 | 2009-09-20 | Ongoing |
| PSA | Palmer Station, Antarctica, United States | -64.9200 | -64.0000 | 10 | 1544 | 1978-01-30 | 2009-05-25 | Ongoing |
| PTA | Point Arena, California, United States | 38.9546 | -123.7408 | 17 | 433 | 1999-01-05 | 2009-10-21 | Ongoing |
| RPB | Ragged Point, Barbados | 13.1700 | -59.4300 | 45 | 1069 | 1987-11-22 | 2009-10-21 | Ongoing |
| SCS | South China Sea, N/A | Variable | Variable | 15 | 1192 | 1991-07-05 | 1998-10-15 | Terminated |
| SCT | Beech Island, South Carolina, United States | 33.4057 | -81.8334 | 419.2 | 295 | 2008-08-14 | 2009-10-21 | Ongoing |
| SEY | Mahe Island, Seychelles | -4.6700 | 55.1700 | 7 | 1785 | 1980-01-17 | 2009-08-04 | Ongoing |
| SGI | Bird Island, South Georgia, United Kingdom | -54.0000 | -38.0500 | 30 | 78 | 1989-02-11 | 1992-08-13 | Terminated |
| SGP | Southern Great Plains, Oklahoma, United States | 36.8000 | -97.5000 | 374 | 383 | 2002-04-02 | 2009-10-15 | Ongoing |
| SHM | Shemya Island, Alaska, United States | 52.7200 | 174.1000 | 40 | 1069 | 1985-09-11 | 2009-09-13 | Ongoing |
| SMO | Tutuila, American Samoa | -14.2474 | -170.5644 | 42 | 2054 | 1973-08-27 | 2009-09-17 | Ongoing |
| SPO | South Pole, Antarctica, United States | -89.9800 | -24.8000 | 2810 | 1747 | 1975-02-09 | 2009-01-25 | Ongoing |
| STC | Ocean Station C, United States | 54.0000 | -35.0000 | 6 | 175 | 1968-11-21 | 1973-05-12 | Terminated |
| STM | Ocean Station M, Norway | 66.0000 | 2.0000 | 5 | 2803 | 1981-03-12 | 2009-10-04 | Ongoing |
| STR | Sutro Tower, San Francisco, California, United States | 37.7553 | -122.4517 | 486 | 602 | 2007-10-02 | 2009-10-12 | Ongoing |
| SUM | Summit, Greenland | 72.5800 | -38.4800 | 3238 | 459 | 1997-06-23 | 2009-07-16 | Ongoing |
| SYO | Syowa Station, Antarctica, Japan | -69.0000 | 39.5800 | 14 | 505 | 1986-01-25 | 2009-01-15 | Ongoing |
| TAP | Tae-ahn Peninsula, Republic of Korea | 36.7300 | 126.1300 | 20 | 821 | 1990-11-24 | 2009-09-13 | Ongoing |
| TDF | Tierra Del Fuego, Ushuaia, Argentina | -54.8700 | -68.4800 | 20 | 242 | 1994-09-14 | 2009-08-07 | Ongoing |
| THD | Trinidad Head, California, United States | 41.0541 | -124.1510 | 107 | 344 | 2002-04-19 | 2009-10-16 | Ongoing |
| UTA | Wendover, Utah, United States | 39.9000 | -113.7200 | 1320 | 837 | 1993-05-06 | 2009-10-19 | Ongoing |
| UUM | Ulaan Uul, Mongolia | 44.4500 | 111.1000 | 914 | 800 | 1992-01-01 | 2009-08-26 | Ongoing |
| WBI | West Branch, Iowa, United States | 41.7250 | -91.3530 | 619.7 | 536 | 2007-06-28 | 2009-10-20 | Ongoing |
| WGC | Walnut Grove, California, United States | 38.2650 | -121.4911 | 483 | 628 | 2007-09-21 | 2009-10-17 | Ongoing |
| WIS | Sede Boker, Negev Desert, Israel | 31.1300 | 34.8800 | 400 | 713 | 1995-11-27 | 2009-09-29 | Ongoing |
| WKT | Moody, Texas, United States | 31.3200 | -97.3300 | 256 | 299 | 2001-02-11 | 2009-10-14 | Ongoing |
| WKT | Moody, Texas, United States | 31.3200 | -97.3300 | 708 | 823 | 2006-07-07 | 2009-10-13 | Ongoing |
| WLG | Mt. Waliguan, Peoples Republic of China | 36.2879 | 100.8964 | 3810 | 896 | 1990-08-05 | 2009-07-27 | Ongoing |
| WPC | Western Pacific Cruise, N/A | Variable | Variable | 10 | 99 | 2004-12-01 | 2008-09-10 | Ongoing |
| ZEP | Ny-Alesund, Svalbard, Norway and Sweden | 78.9000 | 11.8800 | 475 | 906 | 1994-02-11 | 2009-08-17 | Ongoing |