Skip to main content

Auckland air quality report May 2023

Louis Boamponsem, Auckland Council Research and Evaluation Unit, RIMU
Auckland Council Research and Evaluation Unit, RIMU
Publication date:  



Most monitoring sites have recorded slightly higher concentrations of particulate matter (PM2.5) compared to the previous year. As in the previous year, the highest concentrations of both PM10 and PM2.5 were recorded at Queen Street site. The ongoing construction activities in the city centre (e.g., the city rail link project) is a primary factor.

As expected, the city centre sites have recorded the highest levels of nitrogen dioxide (NO2) concentrations. The Queen Street city centre site recorded higher levels of NO2 in March and April, in contrast to the levels observed in the first two months of the year. This marks a deviation from the short-term downward trend in NO2 levels that have been observed at the city centre sites since January 2020. The exact cause for this shift is unclear and requires further investigation.

There has been an increase in sulphur dioxide (SO2) levels at the two monitoring stations, and the reason for this is unclear. Further studies are needed to determine the cause of this increase.

It is important to note that air quality at a monitoring site can vary from year to year due to weather and other influences. For a trend analysis of change, please see Table 2 and Auckland air quality report, October 2021. ...


Read the frequently asked questions about the air quality monitoring in the Auckland region.

For more information or questions, please send inquiries to:

This edition includes a focus on the Pakuranga air quality monitoring site.

Auckland Council, May 2023

Previous reports



2022 reports (selected)