Air Quality conditions have been listed as very unhealthy or hazardous for several days in a row around North Central Washington.
It was a major improvement since Sunday when air was rated as "hazardous," the worst in recent years.
Wind from the northeast helped thin the smoke Monday and Tuesday, just in time for the opening of the Benton Franklin Fair and Rodeo on Tuesday.More news: Governor issues emergency proclamation as Lane churns toward Hawaii
A stronger push of marine air is expected to start clearing out the smoke Wednesday night, and the weather service forecasts smoke to be nearly completely out of the area by this weekend.More news: United States sanctions Russian shipping companies
Western Washington is under an air quality alert until 5 p.m. Wednesday.
Those most vulnerable to high temperatures include infants and toddlers, pregnant women, seniors, those working or exercising in the heat, persons with chronic illnesses, people living alone without air conditioning, and the homeless.
However, it can vary around the Tri-Cities. For one, sensitive groups are advised to reduce or reschedule strenuous activities outdoors.More news: Ton-up Kohli piles on the agony for England
Highs Wednesday and Thursday should be in the high 80s to low 90s in the Tri-Cities.