An air monitoring station near Wellington has passed dangerous climate change milestone.
The monitoring site at Baring Head recorded carbon dioxide readings of over 400 parts per million.
Similar marks have been passed at Hawaii’s Mauna Loa station in November and Tasmania’s Cape Grim last month.
However, this is the first time it has been recorded in New Zealand.
Baring Head was particularly significant because the air it measured was not from around factories.
Scientists knew the level would eventually be reached.
When the mark was passed in Tasmania it prompted Greenpeace to call for laws in Australia to end fossil fuel industries.
Reducing the levels to below 400ppm would likely take many years of emissions reduction.