JEFFERSON CITY, MO — Environmental and conservation advocates are intensifying pressure on state regulators, calling on the Missouri Air Conservation Commission to reject a newly proposed draft Regional Haze Plan put forward by the Department of Natural Resources (DNR). Critics argue that the revised framework represents a significant step backward from previous environmental commitments, actively stripping away established pollution controls for several major coal-fired power plants across the state.
The public hearing on the controversial draft comes as the state faces mounting scrutiny over its air quality compliance under the federal Clean Air Act. With the public comment period remaining open through September 3, environmental groups, public health advocates, and national park defenders are urging residents and stakeholders to demand stricter oversight of industrial emissions that degrade both local visibility and the pristine vistas of America’s most treasured federal lands.
Main Facts
At the core of the dispute is the Missouri DNR’s latest draft Regional Haze Plan, which lays out the state’s strategy for reducing air pollution that causes visibility-obscuring haze in national parks and designated wilderness areas.
Environmental organizations, spearheaded by the Sierra Club and the National Parks Conservation Association (NPCA), point out that the current draft is notably weaker than its predecessor. Specifically, the new DNR proposal removes previously established consent agreements for five major coal-burning power plants in Missouri:
- AECI New Madrid Plant (New Madrid County)
- AECI Thomas Hill Energy Center (Randolph County)
- Ameren Missouri Labadie Energy Center (Franklin County)
- Sikeston Power Station (City of Sikeston)
- City Utilities of Springfield John Twitty Energy Center (Greene County)
These consent agreements were explicitly acknowledged in the state’s 2022 plan as critical mechanisms required for Missouri to make "reasonable progress" toward achieving natural visibility targets. By removing these mandates, the updated draft plan leaves tens of thousands of tons of haze-causing pollutants—primarily sulfur dioxide ($SO_2$) and nitrogen oxides ($NO_x$)—uncontrolled, despite the ready availability of cost-effective pollution-reduction technologies.
The pollution generated by these facilities does not respect state lines. It severely impacts visibility and air quality within Missouri’s own protected federal areas, such as the Hercules-Glades and Mingo Wilderness Areas, while also blowing downwind to degrade scenic views and air standards at iconic regional destinations like Mammoth Cave National Park in Kentucky and the Great Smoky Mountains National Park along the Tennessee-North Carolina border.
Chronology of the Regulatory Battle
The current showdown between Missouri environmental regulators, federal oversight agencies, and conservation groups is the latest chapter in a multi-year regulatory saga regarding the state’s compliance with the Clean Air Act’s Regional Haze Rule.
- 2022: The Missouri Department of Natural Resources submits its initial Regional Haze Plan to the U.S. Environmental Protection Agency (EPA). Within this document, the DNR explicitly notes that specific consent agreements tied to major coal plants are necessary to maintain reasonable progress toward clearing up regional air pollution.
- July 2024: Following a rigorous review process, the EPA officially disapproves key portions of Missouri’s 2022 Regional Haze Plan, determining that the state’s strategy fails to adequately address visibility-impairing emissions from industrial sources. (Though the partial disapproval is issued, the administrative process to finalize it formally remains ongoing.)
- Present (Current Review Cycle): Rather than correcting the deficiencies identified by federal regulators in the 2022 framework, the Missouri DNR drafts and advances a new, even weaker Regional Haze Plan. This updated version actively strips out the previously relied-upon consent agreements for the five major coal plants.
- September 3: The public comment period for the controversial draft plan concludes, serving as a critical deadline for public pushback before the Air Conservation Commission decides whether to advance or reject the DNR’s proposal.
Supporting Data and the "Class I" Area Mandate
To understand the stakes of the Missouri Regional Haze Plan, it is necessary to examine the federal legal framework governing clean air in public lands.
Under the Clean Air Act, Congress designated 156 national parks and wilderness areas across the United States as "Class I" areas. These locations—which include premier national parks, wildlife refuges, and wilderness expanses—are granted the highest degree of air quality protection under federal law. The overarching objective of the Clean Air Act’s Regional Haze Rule is to eliminate human-made visibility impairment in these Class I areas, ultimately returning them to natural, crystal-clear visibility conditions.
However, progress toward these federally mandated goals has been alarmingly slow. According to comprehensive research and data compiled by the National Parks Conservation Association (NPCA), a staggering 97 percent of national parks across the country continue to suffer from significant or unsatisfactory levels of regional haze pollution.
In the Midwest, emissions from coal-fired power plants like those operating in Missouri are primary contributors to this persistent haze. Fine particulate matter and secondary pollutants—formed when sulfur dioxide and nitrogen oxides react in the atmosphere—travel hundreds of miles, creating a milky, obscured layer over forests, mountains, and valleys that should otherwise offer panoramic views spanning dozens of miles.
Official Responses and Stakeholder Perspectives
The pushback against the DNR’s draft plan has united local and national environmental organizations in a shared demand for stricter regulatory oversight. Critics argue that the state agency is capitulating to utility interests at the expense of public health, tourism economies, and environmental stewardship.
"Our country’s most beautiful places belong to all of us, and we need the Missouri Air Conservation Commission to reject the DNR’s proposed plan and tell the agency to come back with a new one that actually reduces haze-causing air pollution from coal plants," said Jenn DeRose, a Missouri-based strategist with the Sierra Club’s Beyond Coal Campaign.
DeRose and other advocates emphasize that modernizing or operating pollution controls at aging coal plants is entirely feasible, but utility operators have historically resisted these investments unless legally compelled by binding state and federal agreements.
The economic and cultural value of these protected public lands was further underscored by regional park advocates who point out that Missouri’s industrial emissions have far-reaching geographic consequences.
"America’s national parks and wilderness areas are truly special places, cherished by millions of visitors to our public lands," said Crystal M.C. Davis, Senior Regional Director for the Midwest at the National Parks Conservation Association.
Davis continued: "For many, a trip to Great Smoky Mountains or Mammoth Cave is a once-in-a-lifetime opportunity, but nearby Missouri’s air pollution dirties the air and ruins scenic views in these parks and the state’s wilderness areas. Missouri’s Regional Haze Plan leaves tens of thousands of tons of pollution uncontrolled, despite cost-effective solutions available. The Missouri DNR is failing to make progress toward clean, clear, healthy air and improve visibility in our parks for Missourians and all who visit here."
Implications for Missouri’s Energy and Environment
The outcome of the Missouri Air Conservation Commission’s review carries profound implications for the state’s environmental trajectory, public health, and regulatory credibility.
- Federal Overreach and Legal Vulnerability: By submitting a plan that directly contradicts EPA findings and removes established emissions guardrails, the Missouri DNR risks triggering a Federal Implementation Plan (FIP). If the EPA ultimately rejects the state’s finalized submission, federal authorities could step in and impose stricter, mandatory pollution controls directly on Missouri utilities, bypassing state-level negotiations altogether.
- Public Health Co-Benefits: While the primary legal driver of the Regional Haze Rule is visibility, the pollutants targeted—particularly sulfur dioxide, nitrogen oxides, and fine particulate matter ($PM_2.5$)—are notorious triggers for respiratory and cardiovascular illnesses. Curtailing emissions from the Labadie, New Madrid, Thomas Hill, Sikeston, and John Twitty plants would yield immediate health benefits for nearby communities, reducing asthma attacks, emergency room visits, and premature mortality.
- The Broader Energy Transition: As utilities across the country increasingly pivot toward renewable energy sources like wind, solar, and battery storage, locking in strict haze regulations ensures that remaining fossil-fuel infrastructure is held to rigorous environmental standards. Allowing coal plants to operate with fewer environmental constraints undermines fair market competition for clean energy alternatives and slows the broader modernization of the Midwest’s power grid.
As the September 3 deadline for public comments approaches, the ball is firmly in the court of the Missouri Air Conservation Commission. Environmental advocates and park enthusiasts are calling on citizens across the state to make their voices heard, urging the commission to send the DNR back to the drawing board to craft a Regional Haze Plan that prioritizes clean air, public health, and the preservation of America’s natural heritage.
