Ambient air quality in Auckland – trend analysis 2015 to 2024. State of the environment reporting

Extract from the Executive summary:

Air quality refers to the condition of the air we breathe, shaped by the presence of pollutants that can harm human health and the environment. Good air quality is essential for the well-being of individuals and the health of ecosystems. Poor air quality is linked to respiratory and cardiovascular diseases and can even lead to premature death. Auckland’s air quality is generally good compared to many cities worldwide, thanks in part to its geography and climate. However, local activities – including transport, domestic heating, and industry – continue to influence pollutant levels. Auckland Council has monitored ambient air quality for over four decades using high-accuracy equipment and nationally recognised standards. This long-term monitoring supports a robust scientific understanding of pollutant levels, trends, and sources, enabling the Council to manage air quality effectively under the Resource Management Act 1991.

This report presents an analysis of air quality trends in Auckland over the past decade, with a particular focus on the last five years. It includes long-term and seasonal statistics for key pollutants and incorporates source apportionment data for particulate matter (PM₁₀ and PM₂.₅) to identify contributing emission sources. ...

Auckland Council technical report, TR2025/26

September 2025

See also

Te oranga o te taiao o Tāmaki Makaurau. The health of Tāmaki Makaurau / Auckland’s natural environment in 2025. A synthesis of Auckland Council’s state of the environment reporting