High concentrations of PM₁₀ are far more common in the South Island
There is a clear divide between the two main islands of New Zealand, with higher than recommended concentrations of PM10 being much more common in the South Island than in the North.
- In 2020, 18 stations (out of 56 total) exceeded the latest WHO guidance for annual average PM10 concentrations; 14 of these stations were in the South Island
- In 2020, 15 monitoring stations exceeded the NESAQ limit for daily PM10 concentrations, most of which (12 stations) were in the South Island
- Between 2005 and 2020, 69% of all exceedances of the NESAQ daily limit occurred during winter and a further 19% in autumn.
Read more in our latest factsheet 'Particulate matter concentrations (PM₁₀): https://www.reports.esriuk.com/view-report/4e0791bef2e949929958f8f2c0181ece/NZ
Or view the PDF version here: https://ehinz.ac.nz/assets/Factsheets/Released_2022/PM10-concentrations_112022.pdf