Westport and Reefton had similar concentrations of PM10, with 3 and 4 samples (respectively) above national guidelines. However, the 2004 results from westport showed no exceedences.
Greymouth was much lower with no exceedence of guidelines.
Runanga is estimated to be marginally higher than Greymouth and Hokitika is likely to intermediate between those measured in Greymouth and in Westport.
Reefton had 16 exceedences of the PM10 guideline during the winter months of 2006 and will be continuously monitored this winter.