This morning between 8:04 and 9:13 a.m., we unfortunately experienced two distinct sudden and unforeseeable bleeder emissions from No.2 Blast Furnace

Bleeder emissions are the release of an air emission from the blast furnace (through a safety relief valve). The visible emission contains primarily carbon and coal.

The emissions occurred while the Ironmaking teams were starting up the blast furnace after it was down during unusual circumstances in Steelmaking. Our steelmaking facilities and processes involve many interconnected and closed loop systems that our teams manage. In terms of Ironmaking, Blast Furnaces produce liquid iron for the KOBM and EAF steelmaking facilities. When a longer than planned shutdown occurred at the KOBM, the Ironmaking teams slowed production and rotated between our three Blast Furnaces to manage production balance, to avoid disposing liquid iron that is not needed (coffining) and to perform maintenance while Furnaces were down. The KOBM shutdown was extended to undertake a wider scope of maintenance work than what was initially planned.

Note that our Blast Furnaces also supply fuel (Blast Furnace Gas) to our Cokemaking facilities, and during this unplanned extension of work at the KOBM, this gas was interrupted. This interruption causes a need for longer coking (baking) times, which can also cause an increase in visible emissions from the coke stacks.

We appreciate those who have reached out with regard to this issue. Our Ironmaking and Environment teams have stabilized the furnace and are investigating the cause and assessing any potential impact. They also notified the Ontario Ministry of Environment, Conservation and Parks immediately and accordingly. Follow up communication will be undertaken as needed.

About ArcelorMittal Dofasco

About ArcelorMittal Dofasco ArcelorMittal Dofasco is Canada’s largest producer of flat carbon steel and is part of the world’s largest steel and mining company. Headquartered in Hamilton, ON, our more than 5,000 employees are dedicated to being world class as we strive to transform tomorrow with lighter, stronger and more sustainable steel. For us, steel is the fabric of life, as it is at the heart of the modern world. ArcelorMittal has a presence in more than 60 countries and an industrial footprint in over 20 countries. Guided by a philosophy to produce safe, sustainable steel, we are the leading supplier of quality steel in the major global steel markets including automotive, construction, household appliances and packaging, with world-class research and development and outstanding distribution networks. For more information about ArcelorMittal Dofasco, please visit:

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