The Ministry of Environment & Climate Change Strategy says the high concentrations of fine particulate matter in the air have returned.
As a result, the Dust Advisory that was in effect for all of last week, is back.
The 24-hour average for Quesnel was at 81.9 micrograms per cubic metre on Wednesday morning.
The level peaked at 192 last week, before some snow gave the city a brief break.
The provincial air quality objective is 50.
The 24-hour reading in Williams Lake is at 35.2 micrograms per cubic metre.
Road traction material is the main culprit for the high dust levels.