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Change in pollution levels. Auckland Council air quality monitoring network, alert level 2 week one

Shanju Xie
Auckland Council Research and Evaluation Unit, RIMU
Publication date:  



  • Pollution concentrations returned to normal or above normal levels (average of previous years) as we moved to Alert Level 2, except for the city centre which remained lower than normal.
  • The traffic pollutant nitrogen dioxide (NO2) increased across all sites compared to the Level 3 period (28 April-13 May), returning to or above normal levels except for the city centre which was only 68% of normal levels.
  • Particulate matter ( PM10 and PM2.5) did not show such a consistent pattern with increases at some sites and decreases at others. PM10 and PM2.5 were at or below normal levels. PM10 and PM2.5 at the city centre were 80% and 92% of normal levels, respectively.


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See also

Reduction of air pollution levels seen in the Auckland Council air quality monitoring network for the lockdown (Level 4 Alert) period (26 March-27 April)

May 2020