Skip to main content

Auckland air quality report July 2021

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



  • No breach of national air quality standards has occurred this year (January to June).
  • Overall, air quality has slightly improved in Auckland.
  • There is a downward trend in nitrogen dioxide (NO2) concentration in the Auckland CBD.
  • Sulphur dioxide (SO2) concentrations in the monitoring sites are reducing.
  • PM10 source apportionment modelling study revealed that 92% of the concentrations come from five common source contributors in Auckland urban sites. These sources are: biomass burning (mainly from home heating), motor vehicles, secondary sulphate, marine aerosol, and soils (windblown soil, road dust, and dust generated by earthworks, construction, and roadworks).
  • Biomass burning source contributions to urban PM10 levels in Auckland were found to be increasing.
  • The long-term trend analysis of motor vehicles, secondary sulphate, and soils contributions to PM10 shows that concentrations are decreasing over the monitoring period.

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

For more information or questions, please send inquiries to:

Auckland Council, July 2021