Glycidyl methacrylate leak forces evacuation in Toledo, Ohio

A glycidyl methacrylate leak has placed north Toledo, Ohio, under emergency restrictions after hundreds of residents had to leave their homes on Tuesday night. City officials said on Wednesday, October 21, that the release was continuing and that both the evacuation of the immediate area and a wider shelter-in-place order remained in effect.

The incident is at MC Tank Transport’s terminal on Progress Avenue. The evacuation order affects about 983 residents, according to figures reported by U.S. news outlets. Officials face two concerns: exposure to a substance that can damage the eyes, skin and respiratory tract, and the possibility of a dangerous reaction inside the tank.

The city information used for this article was updated at 10:38 a.m. Eastern time. As of that update, officials had not announced that the restrictions had been lifted.

A night of evacuations and school closures

Firefighters ordered an evacuation within a one-mile radius, approximately 1.6 kilometers, at 10:48 p.m. Tuesday. At 4:24 a.m. Wednesday, a shelter-in-place order was added for a three-mile radius, about 4.8 kilometers. These are different instructions: people in the evacuation area must leave; those outside it but within the shelter-in-place zone must remain indoors.

The city asked residents to close doors and windows, switch off ventilation that draws in outside air and keep pets indoors. It opened a temporary shelter at Shoreland Elementary School, with Red Cross assistance and TARTA buses available in the Meijer parking lot off East Alexis Road.

The emergency also disrupted schools and businesses. Local television station 13abc reported that Toledo Public Schools and Washington Local Schools had canceled classes and that nearby businesses had been evacuated. Raintree Village mobile home park and the Alexis Addition neighborhood are among the affected areas. The response extends beyond city boundaries: The Sun Times News reported school closures in neighboring Monroe County, Michigan.

Fog complicated efforts to interpret what could be seen in the streets. City officials warned that people could not distinguish the fog from the chemical release simply by looking at it. Nor does detecting an odor reveal the concentration being inhaled. The official map and emergency instructions are the reference for identifying the protective zones.

A chemical release, not a confirmed explosion

Mayor Wade Kapszukiewicz initially used the word explosion to describe the incident. City spokesperson Rachel Hart later clarified to USA TODAY that no explosion had occurred: material had escaped from a tank, producing a large cloud. The clarification is important because a leak and an explosion describe different events, even though either can warrant protective measures.

That does not remove the risk that prompted responders to keep their distance. During the morning, officials explained that specialists had avoided approaching the tank while assessing its explosive potential. The mayor mentioned a reassessment at about 9:30 a.m.; that time was not an automatic authorization to return home.

In a statement reproduced by 13abc, MC Tank Transport confirmed that equipment associated with its operations was involved and that the chemical was glycidyl methacrylate. The company said it had mobilized specialist resources and was working with authorities. The cause of the release remained unclear.

Air monitoring is underway; odor cannot replace the results

The city said the U.S. Environmental Protection Agency was overseeing measurements at several locations around the evacuation perimeter, with additional testing planned around the shelter-in-place zone. Results would be released when available. Without those concentrations and the duration of exposure, an image of the cloud cannot establish the risk to an individual.

Officials advised people with symptoms to consult a medical professional and to go to an emergency department or call 911 for serious symptoms, such as difficulty breathing. A sheriff’s deputy went to a hospital for evaluation, according to local reporting, which described his condition as not serious. That case alone does not provide a complete count of people exposed.

What is glycidyl methacrylate?

Glycidyl methacrylate, also known as GMA, is a colorless liquid used as a monomer—a molecule that can react with others to form polymers. The International Agency for Research on Cancer explains that it is used mainly in epoxy polymers and vinyl and acrylic resins, which are subsequently used in adhesives, sealants and coatings, among other applications.

Its industrial usefulness comes from its reactivity, but that property requires control. The National Oceanic and Atmospheric Administration’s CAMEO database warns that heat can trigger violent polymerization reactions. The safety data sheet published by Toledo adds that the substance is combustible and that containers can explode when heated. Those are properties of the chemical; they do not establish what happened inside the tank in this incident.

The International Chemical Safety Card prepared for the International Labour Organization and the World Health Organization states that the substance can enter the body through inhalation, skin contact and ingestion. It severely irritates the eyes, skin and respiratory tract, and repeated contact can make the skin more prone to allergic reactions. More recent technical documentation also warns of burns and serious eye damage.

The international cancer agency classifies it as probably carcinogenic to humans, Group 2A. That classification identifies a hazard supported by experimental evidence; it does not quantify each resident’s risk or mean that occasional exposure will necessarily cause cancer. The released monomer should also be distinguished from finished products: the agency does not expect exposure to the monomer from using materials that have already been polymerized. In Toledo, the immediate issue is the substance released and the extent of people’s contact with it.