Particulate matter

Particles are classified by their size with PM10 referring to inhalable particles smaller than 10 microns (μm) in diameter. Of the inhalable particles, those smaller than 2.5 microns (PM2.5) can penetrate more deeply into the respiratory system and therefore pose the greatest risk to health (see diagram of particle sizes).

Benchmarking & Resources has more information on the guidelines and standards used for the following summary tabs.


Annual summary

The map shows annual average PM10 (μg/m3) measured at core monitoring sites across the region. Results are shown as a percentage of the national guideline which is an annual average of 20 μg/m3. The regional target is 13 μg/m3 or lower which is based on air quality being maintained at the ‘acceptable’ or better category which corresponds to no more than 66% of the national guideline (green to dark blue).

The table also shows the annual summary for PM10 reported as a 24-hour average from core monitoring sites across the region. The national standard allows one high pollution day per year which is a 24-hour average above 50 μg/m3 (or the 2nd highest 24-hour average to be below 50 μg/m3).The regional target is a maximum 24-hour average of 33 μg/m3.

  • Drag and scroll on the map to move and zoom in on areas of interest.
  • Hover on the site circles to see more information.
  • Use the selection box ( ) to subset the map and table data to that area.
  • Click on sites in the table to highlight them on the map.
  • Use the arrows ( ↓↑ ) next to the table headers to sort the data.