World class research contributing to our understanding of greenhouse gases, ozone depletion, and urban air pollution.

  • UV index signage at Lauder

    UV Index Information

    The UV Index is a measure of the intensity of UV radiation. The larger the number, the more intense the UV. In New Zealand, its maximum summer value is generally about 12, but it can exceed 13 in the far North. In winter it reaches peak values of 1 or 2. Values of 10 or more should be considered as "extreme". At high altitude tropical sites (eg Mauna Loa Observatory, Hawaii), the UV Index can exceed 20.The UV Index supersedes the idea of "Time to Burn" or "Burn Time", which has been used previously in New Zealand.
  • Common hydrological terms

    Education Resource
    Descriptions of the common terms that explain the processes that occur in hydrology.
  • Air quality monitoring with low-cost sensors

    NIWA provides ambient air quality monitoring services using low-cost ODIN (Outdoor Dust Information Node) sensors.
  • UV Index at Leigh - 16 October 2023

    Yesterday's UV Index

    Plots of UV levels throughout the day at different locations.
  • Layers of the atmosphere

    Education Resource
    The atmosphere is comprised of layers based on temperature. These layers are the troposphere, stratosphere, mesosphere and thermosphere.
  • Tonga volcano “afterglow” causes dazzling skies in Antarctica

    Media release
    Antarctica is experiencing stunning skyscapes like those recently seen in New Zealand, thanks to the afterglow effect from the Tongan volcano.
  • Front and rear views of a Mark I dosimeter badge. [NIWA]

    Personal UV Dosimeters

    NIWA has developed personal UV dosimeter badges to support studies relating UV exposure to human health.
  • Storms and cyclones

    Education Resource
    Common questions about storms and cyclones in New Zealand.
  • UV Atlas

    More information about NIWA's UV Atlas
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    Climate change, global warming and greenhouse gases

    Climate data and common terms explaining the causes and effects of climate change.
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    Smart Rain Intensity Gauge - NIWA SRIG

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    What do 'carbon neutral' and 'carbon footprint' mean?

    A carbon neutral activity is one that has a carbon footprint of zero.