Air quality alerts were in effect Monday across parts of Oregon, Washington, and Texas, warning residents that outdoor exposure could pose health risks. Wildfire smoke and elevated ozone levels are the primary concerns in the affected regions.
In the Pacific Northwest, wildfire smoke from regional blazes is pushing into communities in Oregon and Washington, with pollution levels potentially reaching unhealthy thresholds. The Oregon Department of Environmental Quality issued a smoke advisory for Crook, Jefferson, and Wasco counties, as well as Hood River County, which was expected to remain in effect until Wednesday afternoon. These advisories cover areas including Prineville, Madras, The Dalles, and Hood River.
The Washington Department of Ecology issued a similar alert for Chelan, Douglas, Grant, and Okanogan counties, encompassing cities like Wenatchee, Moses Lake, and Omak. Kittitas County, including Ellensburg, also faces a smoke alert. Officials in Washington cautioned that concentrations of fine particulate matter (PM2.5) could reach unhealthy levels in areas downwind of active wildfires.
PM2.5 particles, measuring no more than 2.5 micrometers across, are small enough to penetrate deep into the lungs and can potentially enter the bloodstream. Both wildfire smoke and ozone can inflame the lungs and airways, aggravate conditions such as asthma and other respiratory diseases, and cause symptoms like coughing, wheezing, and difficulty breathing. Residents with pre-existing heart or lung conditions are advised to follow medical guidance and take extra precautions.
Meanwhile, in Texas, the Dallas-Fort Worth metropolitan area faced an Ozone Action Day due to atmospheric conditions favoring the formation of high levels of ground-level ozone. Unlike the Pacific Northwest alerts, this warning is not attributed to wildfire smoke. Ground-level ozone forms when pollutants react in sunlight and can cause chest discomfort and make breathing more difficult, particularly for children, older adults, and those active outdoors. Texas officials encouraged residents to reduce pollution by carpooling, conserving electricity, and ensuring vehicle maintenance.
The Big Grass Fire in Oregon, which began July 23 and was 72 percent contained as of Sunday, had burned 578,448 acres and threatened 735 structures, leading to evacuation orders for 159 people. More than 1,000 firefighters are working to contain the blaze, which was intensified by thunderstorms and erratic winds. Aerial views show the smoke pall from the active Grasshopper Fire, located on the eastern side of Mt Hood.