PPM and PPB are units used in atmospheric chemistry to describe the concentration of gases.

NIWA makes a range of trace gas data freely available on our FTP site.

Tuna or freshwater eels are a very significant, widely-valued, heavily-exploited, culturally iconic mahinga kai resource.

Seasonal climate summaries from summer 2001 to the present.

View a collection of maps showing the impact of past El Niño and La Niña events.

NIWA is today issuing some scientific information on the parasite Bonamia ostreae, recently discovered in Big Glory Bay, Stewart Island, and the risk it poses to the Bluff oyster fishery.

Water clarity or turbidity is the cloudiness or haziness in a fluid caused by individual small particles (suspended solids).

Impacts of hydro-electric activities on water quality and mahinga kai.

The atmosphere is comprised of layers based on temperature. These layers are the troposphere, stratosphere, mesosphere and thermosphere.

Tairua station