SH Location | Percent Change | NH Location | Percent Change |
N Pole (−90˚S) | 15% | Alert, Canada (82˚N) | 15% |
Cape Grim (−41˚S) | 15% | Azores, Port (38.7˚N) | 15.5% |
Samoa (−14˚S) | 15.8% | Mauna Loa (19.5˚N) | 15.5% |
Average SH | 15.3% | Average NH | 15.3% |