Site is located at Midway Atoll National Wildlife Refuge.The Refuge is approximately 2,012 km NW of Honolulu, HI andconsists of three islands (Sand, Eastern, and Spit) whichare surrounded by a fringing coral reef. The entire Refugeis 120,749 ha in size and is home to over 2 million seabirds.
| Parameter | Formula | First Sample Date | Status |
|---|---|---|---|
| Carbon Dioxide | CO2 | 1985-05-03 | Ongoing |
| Methane | CH4 | 1985-05-03 | Ongoing |
| Carbon Monoxide | CO | 1990-11-27 | Ongoing |
| Molecular Hydrogen | H2 | 1990-11-27 | Ongoing |
| Nitrous Oxide | N2O | 1997-07-30 | Ongoing |
| Sulfur Hexafluoride | SF6 | 1997-07-30 | Ongoing |
| Carbon-13/Carbon-12 in Carbon Dioxide | d13C (CO2) | 1992-01-28 | Ongoing |
| Oxygen-18/Oxygen-16 in Carbon Dioxide | d18O (CO2) | 1992-01-28 | Ongoing |
| Carbon-13/Carbon-12 in Methane | d13C (CH4) | 2015-12-23 | Ongoing |
| Methyl Chloride | CH3Cl | 2006-02-27 | Terminated - 2018-06-11 |
| Benzene | C6H6 | 2007-01-01 | Terminated - 2018-06-11 |
| Methylbenzene | C7H8 | 2007-01-01 | Terminated - 2018-06-11 |
| Ethane | C2H6 | 2006-02-27 | Terminated - 2018-06-11 |
| Ethylene | C2H4 | 2006-02-27 | Terminated - 2018-06-11 |
| Propane | C3H8 | 2006-02-27 | Terminated - 2018-06-11 |
| Propylene | C3H6 | 2006-02-27 | Terminated - 2018-06-11 |
| Isobutane | i-C4H10 | 2006-02-27 | Terminated - 2018-06-11 |
| n-Butane | n-C4H10 | 2006-02-27 | Terminated - 2018-06-11 |
| isopentane | i-C5H12 | 2006-02-27 | Terminated - 2018-06-11 |
| n-Pentane | n-C5H12 | 2006-02-27 | Terminated - 2018-06-11 |
| n-Hexane | n-C6H14 | 2006-02-27 | Terminated - 2018-06-11 |
| isoprene | C5H8 | 2007-01-01 | Terminated - 2018-06-11 |
| Acetylene | C2H2 | 2007-10-09 | Terminated - 2018-06-11 |
U.S. Fish and Wildlife Service