Air Quality

Good visibility is essential to the enjoyment of national parks and scenic areas in Oregon and across our country. The term regional haze refers to air pollution that is transported long distances and reduces the visibility in these areas. Oregon DEQ partners with adjacent states, EPA, and federal land managers to coordinate regional haze programs to improve visibility.
DEQ regulates sources of pollution to reduce regional haze in 12 designated national park and wilderness areas in Oregon and the Columbia River Gorge National Scenic Area. As part of the Regional Haze Program, DEQ identified 29 Oregon facilities that are major sources of regional haze forming pollutants to assess opportunities for potential emissions controls. Facility efforts will be part of a regional haze plan that will be available for public comment in 2021.
DEQ has created fact sheets for the public and facilities to understand and engage in regional haze efforts.
Regional haze is improving. Visibility has improved significantly in nearly all areas of the U.S. from 2000 to 2017. DEQ will continue to work with stakeholders to reach our national 2064 goals of reaching and maintaining natural level visibility conditions.


D Wu, 503-229-5269
no haze
Looking east from Vista House, Columbia River Gorge, good visibility (9 deciview impairment, over 100 miles visibility). Source: WinHaze.
bad haze
Looking east from Vista House, Columbia River Gorge, poor visibility (23 deciview impairment, less than 25 miles visibility). Source: WinHaze