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

Annual PM10 summary results are shown in the map and table. Annual averages are only reported for sites with more than 75% data capture.

Map usage: drag and scroll on the map to move and zoom in on areas of interest, hover on the site circles to see more information, and use the selection box ( ) to subset the map and table data to that area.

Table usage: click on sites in the table to highlight them on the map, and click on table headers or the arrows next to them () to sort the data by that column – holding the shift key allows sorting over multiple columns.