Air quality in the Tri-Cities had deteriorated enough by Monday evening to be considered "unhealthy for sensitive groups."
Infants, children, adults older than 65 and pregnant women were advised to limit time outdoors, along with people with heart or lung disease, asthma or diabetes and stroke survivors.
Smoke from wildfires as far south as central California and smoke from Eastern Oregon wildfires is moving over the Tri-Cities, said the National Weather Service.
The Benton Clean Air Agency rated air quality at 110 by Monday evening, using a national system set by the Environmental Protection Agency to match the Clean Air Act.
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Ratings of 51 to 100 is considered "moderate." When the rating reaches 101 to 150, it is considered "unhealthy for sensitive groups."
Near real time reporting of Tri-City air conditions can be found on the gauge at bentoncleanair.org.