A chemical spill at the Austin Powder Company’s Red Diamond facility in McArthur, Ohio, on June 11, 2025, prompted widespread evacuations and raised alarms about air quality in surrounding communities. Around 8:30 a.m., a 5,000-gallon tank holding nitric acid failed, releasing approximately 3,000 gallons of the substance. The acid reacted with the air, forming a hazardous orange-brown plume of nitric oxide that drifted over Vinton County. Led by Jackson County Emergency Manager Robert Czechlewski, local authorities swiftly ordered evacuations in the village of Zaleski and nearby areas, as exposure to the gas can cause eye irritation, drowsiness, and even loss of consciousness. The incident, driven by shifting winds, disrupted daily life and sparked concerns about the safety of industrial facilities in the region.
The scale of the crisis mobilized a multi-agency response, including hazmat teams from Jackson, Vinton, and Ross counties, as well as the Ohio Environmental Protection Agency (EPA). Residents were directed to seek shelter at Vinton County High School, where the Red Cross and United Way provided aid. The Federal Aviation Administration (FAA) imposed a 30-nautical-mile no-fly zone around the facility, allowing only emergency aircraft. The event underscored the risks associated with handling volatile chemicals, particularly at a plant like Red Diamond, a key employer in Vinton County known for manufacturing industrial explosives.
- Affected areas: Zaleski village, Creek Road, Morgan Road, Infirmary Road, and State Route 677.
- Chemical involved: Nitric acid, forming nitric oxide upon air exposure.
- Health risks: Eye and respiratory irritation, drowsiness, potential unconsciousness.
- Immediate actions: Evacuations, road closures, air quality monitoring, and shelter setup.
Orange haze over Vinton County
The sight of a dense, orange-brown cloud looming over Vinton County stunned residents and spread rapidly across social media. Images captured by locals, including Kennedi Kovaleski and Edith Conner, revealed the plume’s ominous spread. According to the Ohio EPA, the nitric acid spill triggered a chemical reaction that produced nitric oxide, a gas harmful in high concentrations. While the agency confirmed that the gas release was halted, the plume’s trajectory, driven by winds, complicated response efforts.
Robert Czechlewski noted that a plant worker detected the leak shortly after it began, averting a potentially worse disaster. No explosions or injuries were reported, but the uncertainty surrounding wind conditions has delayed residents’ return. The National Weather Service in Charleston, West Virginia, provided plume tracking data, showing the cloud moving south, a factor that continues to influence evacuation protocols.
The Ohio EPA’s early assessments suggest that 3,000 gallons of nitric acid escaped before containment. Investigators are now probing the cause of the tank failure, with initial reports pointing to a possible mechanical issue. The agency is also monitoring air and soil to ensure no lasting environmental damage.
Coordinated emergency response
The response to the leak was swift and multifaceted. Hazmat teams from three counties descended on the Red Diamond facility to secure the site and assess air quality. The Ohio EPA deployed an emergency response coordinator to oversee containment and environmental monitoring. State Routes 328, 677, and 278 were closed by the Ohio Department of Transportation, isolating the affected area.
Zaleski, a village of roughly 750 people, saw a complete evacuation, with school buses staged at Saint Sylvester Catholic Church to assist those without transportation. Vinton County High School’s gymnasium became a temporary shelter, where Red Cross volunteers distributed water, food, and blankets. The United Way also mobilized resources to support displaced residents.
- Key response measures:
- Road closures to restrict access to hazardous zones.
- Continuous air quality monitoring by hazmat crews.
- Shelter services provided by Red Cross and United Way.
- Environmental oversight by the Ohio EPA.
Health risks and precautions
Vinton County Health Department Director Brad Price outlined the dangers of nitric oxide exposure. While the gas occurs naturally in low levels, elevated concentrations pose significant risks. He urged anyone exposed to rinse their eyes and skin with clean water and seek medical attention for persistent symptoms.
Exposure effects include:
- Mild: Eye, nose, and throat irritation.
- Moderate: Drowsiness and breathing difficulties.
- Severe: Risk of unconsciousness requiring urgent care.
Price also advised monitoring pets and livestock for similar symptoms, as they may be equally vulnerable. No hospitalizations have been reported, but health officials remain vigilant as air quality tests continue.
Austin Powder’s track record
Founded in 1833, Austin Powder Company is one of the oldest explosives manufacturers in the U.S., headquartered in Cleveland. Its Red Diamond plant, operational since 1930, spans 1,200 acres in Vinton County and employs about 250 workers, making it the area’s largest employer. The facility produces industrial explosives for mining and construction, along with detonators and blasting cords.
The company has faced safety issues before. In 2009, an explosion at the McArthur plant injured at least 10 workers, according to historical records. In 2022, Austin Powder settled fines with the U.S. Department of Justice for Clean Water Act violations tied to wastewater management at Red Diamond. These incidents have fueled local concerns about the risks of chemical operations in a rural community.
Disruptions to aviation and transport
The FAA’s no-fly zone, enacted shortly after the leak, disrupted regional air traffic. While John Glenn International Airport in Columbus was unaffected, Rickenbacker International Airport reported delays. The restriction, lifted by 11 a.m., allowed only emergency flights during the crisis, reflecting the incident’s severity.
Road closures also snarled local transport, with drivers rerouted to avoid contaminated areas. The Ohio Department of Transportation indicated that roads would remain closed until air quality is deemed safe, a timeline dependent on wind patterns and environmental assessments.
Environmental monitoring efforts
The Ohio EPA is leading efforts to evaluate the spill’s environmental impact. Nitric oxide, while quick to dissipate, can harm vegetation and water sources in high concentrations. The agency is testing soil and nearby streams to rule out residual contamination, particularly in Vinton County’s hilly terrain, which may have amplified the plume’s spread.
The National Weather Service’s ongoing updates show the cloud moving south, with wind speeds complicating containment efforts. Environmental teams are prioritizing real-time data to guide evacuation and safety measures.
Community on edge
The sudden evacuation orders caught many Zaleski residents off guard. Stories from evacuees describe rushed departures, with some grabbing only essentials like documents and medications. The uncertainty about returning home has left the community anxious, though local support networks have stepped up.
Churches and community groups are collecting supplies for those in shelters, and volunteers are providing transportation and emotional support. The outpouring of solidarity has been a bright spot amid the disruption, with neighbors helping neighbors navigate the crisis.
Ongoing investigations
Emergency crews are focused on maintaining air quality monitoring until nitric oxide levels are safe. The Ohio EPA, alongside local officials, is investigating the tank failure, with early theories suggesting equipment malfunction or human error. Austin Powder has yet to release a detailed statement but is expected to cooperate with authorities.
For now, evacuated residents remain in limbo, staying at the high school shelter or with relatives outside the affected area. The immediate priority is protecting public health, while long-term efforts will center on preventing similar incidents at industrial sites.