Dense smoke has led to very unhealthy to even hazardous air quality in recent days in Washington, Oregon, and Idaho. Much of the smoke remains in the upper atmosphere, so air quality impacts are lower in the Midwest and East. Air quality sensors report moderate air quality across the Upper Midwest, down to the Deep South and over the East Coast. Josh Vander Veen, the air quality analysis chief at MoDNR, explained some of the local impacts from the smoke. Vander Veen also recommends visiting airnow.gov, the official U.S. government air quality monitoring site that features an interactive map and alerts.