Timaru has experienced its 13th day of dirty air so far this winter.
Friday had a 24-hour average concentration of 61 micrograms of suspended particulate per cubic metre of air, well over the 50-microgram threshold that marks "high" levels of air pollution.
The highest concentration of dirty air so far this year was recorded on May 31 with 104 micrograms. The measurements were taken at the air-monitoring site in Anzac Square. There have been two days at Washdyke this winter when the 50-microgram mark has been exceeded.
Christchurch has breached the threshold on 10 occasions this year.
- © Fairfax NZ News