Kiera Jefferson
New Zealand has relatively good air quality due to its low population density and island geography. However, the country still faces pollution issues, particularly regarding water and air quality. Water pollution in New Zealand is an increasing concern, with Auckland being the region with the most polluted waterways as of January 2019. The country's fresh water quality is under pressure from various factors, including agriculture, hydropower, urban development, and climate change. On the other hand, air pollution in New Zealand has mainly been attributed to particulate matter (PM) from burning wood and coal, with concentrations reducing in most monitored areas. Nitrogen dioxide, primarily from vehicle emissions, has also been identified as a significant air pollutant.
| Characteristics | Values |
|---|---|
| Air pollution | Particulate matter (PM) from burning wood and coal, nitrogen dioxide from vehicle emissions, sulphur dioxide, carbon monoxide, nitrogen dioxide, and benzene |
| Water pollution | Sediment from erosion, agricultural runoff, urban runoff, industrial discharges, and pollution from dairy farming |
| Effects of water pollution | Ecological damage, health risks, and cultural impacts on indigenous Māori communities |
| Initiatives to address pollution | New Zealand joined the Climate & Clean Air Coalition (CCAC) in 2013, passed the Climate Change Response (Zero Carbon) Amendment Act in 2019, and formed the primary industry action partnership, He Waka Eke Noa, in 2019 |
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Water pollution
As of January 2019, Auckland is the region with New Zealand's most polluted waterways, with 62% of rivers and lakes graded poor by the Ministry for the Environment for swimming, and 0% graded as good. Water pollution in New Zealand has several negative impacts on the environment, economy, and public health. Ecological damage is caused by pollutants from agriculture, urban runoff, and industrial discharges, which degrade water quality in rivers, lakes, and coastal areas. This harms aquatic ecosystems, leading to reduced biodiversity, fish kills, and disruption of food chains.
Contaminated water sources pose risks to human health through the consumption of polluted water or seafood. Waterborne diseases such as giardiasis and cryptosporidiosis can result from microbial contamination. Water pollution also affects industries such as fisheries and tourism, which rely on clean water and healthy ecosystems.
Cultural impacts are also significant, especially for indigenous Māori communities, as water pollution affects their cultural practices and traditional uses of water bodies, impacting their cultural identity and wellbeing. Agriculture is a major use of lowland areas of New Zealand and has affected water quality. The expansion of intensive dairy production has resulted in greater levels of nitrogen in the soil, surface, and groundwater.
Sediment from the erosion of hills and river banks is another source of water pollution. The high organic content of this sediment is changing sedimentation patterns and increasing organic bed loads and deposition in New Zealand lakes and shallow coastal waters. Fencing off streams and riparian planting have been shown to improve water quality by intercepting runoff of manure, sediments, and fertilizer.
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Air pollution
New Zealand has relatively good air quality due to its low population density and island geography. However, over the past 15-20 years, the air pollutant of most concern in many parts of New Zealand has been particulate matter (PM) from burning wood and coal. Particulate matter (PM) refers to tiny airborne particles, both naturally occurring (e.g. dust, pollen, sea salt) and human-made (e.g. burning of fuels). Their health impact depends on particle size. PM10 refers to coarse and fine particles (less than 10 micrometres) that can enter our airways, while PM2.5 refers to fine particles (less than 2.5 micrometres) that can penetrate deep into our lungs, with ultrafine particles (less than 0.1 micrometres) entering the bloodstream.
Concentrations of PM have been reducing in most monitored areas. However, the updated World Health Organization (WHO) Air quality guidelines (2021) and the Health and Air Pollution in New Zealand (HAPINZ 3.0) report (2022) reveal that health impacts from nitrogen dioxide – primarily from vehicle emissions – are more significant than previously understood. Gas pollutants, including sulphur dioxide (SO2), carbon monoxide (CO), nitrogen dioxide (NO2), and benzene, are primarily monitored in cities, where traffic and industry are often the main sources.
The NZ Transport Agency Waka Kotahi has an extensive monitoring network on state highways around New Zealand. Some of the most polluted air quality monitoring stations include Ashburton, Rangiora, Woolston, Blenheim, and Timaru. The real-time air pollution map provides data on more than 100 countries, and New Zealand's Air Quality Index (AQI) levels fluctuate, with the lowest level of 17 (good) and the highest level of 46 (good) within a 24-hour period in July 2025.
New Zealand is committed to reducing short-lived climate pollutant emissions and is a lead partner in the Climate & Clean Air Coalition's (CCAC) Agriculture initiative. In 2019, the country passed the Climate Change Response (Zero Carbon) Amendment Act, targeting the reduction of net emissions of greenhouse gases. Additionally, a primary industry action partnership, He Waka Eke Noa, was formed in 2019 to deliver a scheme for measuring, managing, and pricing greenhouse gas emissions by 2025. New Zealand is also investing in research and development to reduce agricultural methane emissions and shares its knowledge internationally through various research alliances and partnerships.
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Methane emissions
New Zealand has about 10 million cattle and 26 million sheep, and nearly half of its total greenhouse gas emissions come from agriculture, mainly methane. More than 85% of New Zealand's methane emissions come from two agricultural sources: enteric fermentation and manure management, with enteric fermentation accounting for about 97% of that total. Ruminant animals, such as cows, sheep, deer, and goats, produce methane as a byproduct of their digestive processes.
In response to the issue of agricultural emissions, the New Zealand government has proposed a first-in-the-world tax on cow emissions. The levy will depend on factors such as the number of animals kept, the size of the farm, the type of fertilizer used, and the steps taken to reduce emissions. The government has said that all money raised by the tax in 2025 will be reinvested in research and incentives for farmers to reduce the methane contribution of their herds. The government has set a target of reducing methane emissions to 10% below 2017 levels by 2030 and 24-47% by 2050.
To address water pollution due to dairy farming, Fonterra, New Zealand's largest dairy company, along with several government agencies, instigated the Dairying and Clean Streams Accord. The accord aims to limit livestock access to waterways and encourage farmers to adopt sustainable practices. Fencing off streams and riparian planting have proven effective in improving water quality by intercepting runoff of manure, sediments, and fertilizers.
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Nitrogen dioxide
New Zealand has relatively good air quality due to its low population density and island geography. However, nitrogen dioxide (NO2) is a prevalent air pollutant in the country, primarily from vehicle emissions.
The health impacts of nitrogen dioxide have been found to be more significant than previously understood. According to the HAPINZ 3.0 report, which assesses the air pollution health impacts experienced by New Zealanders in 2016, more than 60% of the over 3,300 deaths associated with anthropogenic air pollution were linked to nitrogen dioxide pollution, mainly from motor vehicles.
To address this issue, regional councils and unitary authorities monitor outdoor air for key air pollutants. They track air pollutants generated from residential, industrial, and traffic sources. These measures help protect air quality and provide insights into factors contributing to air pollution.
It is important to note that while New Zealand's air quality is generally good, the presence of nitrogen dioxide, particularly in urban areas, remains a concern. The data presented on air quality may not be nationally representative, but it offers localized insights and guides policies to improve air quality and protect public health.
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Sediment pollution
New Zealand's fresh water quality is under pressure from various factors, including agriculture, hydropower, urban development, pest invasions, and climate change. Sediment pollution is a significant issue, particularly in coastal areas and estuaries. Sediment enters the water through erosion, agricultural run-off, and urban storm-water systems.
Agricultural practices, particularly dairy farming, are a major contributor to sediment pollution in New Zealand. The expansion of intensive dairy production has resulted in greater levels of nitrogen in the soil and water, as well as increased sedimentation from grazing animals. In 2001, Fish and Game New Zealand started the "dirty dairying" campaign to highlight the ecological impact of pollution from farming intensification. This led to the Dairying and Clean Streams Accord, which aims to limit stock access to waterways and encourage sustainable farming practices.
To address sediment pollution, measures such as fencing off streams and riparian planting have been implemented. These techniques help intercept the runoff of manure, sediments, and fertilizers, using them to enhance the growth of planted zones. While these measures have shown some success, there is still a need for continued efforts to mitigate the impacts of sediment pollution on New Zealand's waterways.
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Frequently asked questions
As of July 30, 2025, the current AQI level in New Zealand is 17, which is considered good. The air pollution poses little to no risk, and no special precautions are needed.
The air pollutant of most concern in New Zealand has been particulate matter (PM) from burning wood and coal. Other sources include vehicle emissions, industrial activities, and residential sources.
New Zealand has over 150 active and historical monitoring sites across its towns and cities, tracking air pollutants generated from different activities. These sites are managed by regional councils and unitary authorities to protect air quality.
Water pollution is an increasing concern in New Zealand, with Auckland being the region with the most polluted waterways as of January 2019. Agricultural runoff, urban development, industrial discharges, and rural land use contribute to the pollution of rivers, lakes, and coastal areas.
Initiatives such as the Dairying and Clean Streams Accord aim to limit the access of livestock to waterways and promote sustainable farming practices. Fencing off streams and riparian planting have proven effective in improving water quality by reducing pollution from surface runoff.
