The most significant air pollutant in New Zealand are small airborne particles in our air (known as particulate matter). Particulate pollutants are of most concern in New Zealand because of their high concentrations in some of our towns. Exposure to high levels of airborne particle pollutants has the potential to cause respiratory and cardiovascular issues. View a factsheet on why air quality is important here.
In some Central Otago towns, PM10 peaks in winter during mornings and evenings when it is coldest and wind is slow. The main source of PM10 is from the burning of solid fuel (i.e. wood) to heat homes. The calm, still conditions of Otago's inland towns mean there is often little ventilation to disperse air pollutants. We are experiencing technical issues with the display of Milton data - these are displaying incorrectly for 2022. You can find daily data in the downloadable air quality dataset on the download data page, or in the graphs on the Milton site page.
PM monitoring history at towns in this region
What is this showing me?
|annual average (µg/m³)
|Highest daily average (µg/m³)
|2nd highest daily average (µg/m³)
|Number of exceedances