Trump’s EPA is paving the way for haze to return to national parks, conservationists warn - AP News

The Trump administration's Environmental Protection Agency is rolling back air quality regulations that environmental groups say will allow haze to accumulate over national parks and wilderness areas. The rules in question were designed to reduce fine particulate pollution and improve visibility at protected sites, a requirement under the Clean Air Act's Regional Haze Program. Conservationists argue that weakening these standards will reverse decades of air quality improvements at iconic parks like the Grand Canyon and Great Smoky Mountains, diminishing the visitor experience and public health protections. The EPA's changes reportedly ease emissions limits that states and power plants must meet, shifting the timeline for compliance away from strict federal targets. Environmental organizations have pledged to challenge the regulatory shift.