Environment Canada recommends limiting outdoor activities and strenuous activity when the air quality is this poor. But the air quality level is expected to improve to a six by Saturday night, and Sunday should be much less smoky, at a level four. The Central Alberta Yogathon held in Red Deer on Saturday was also cancelled due to poor air quality. The air quality level should improve by Saturday night, dropping to a level six. The air quality level is expected to improve to a level four.

Source: CBC News August 18, 2018 17:15 UTC