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Brown Plume from Edgar Thomson Plant Prompts Questions & Complaints, ACHD Response

Updated: Dec 20, 2022

A reddish-brown plume emanating from U.S. Steel’s Edgar Thomson Plant Wednesday evening prompted questions and complaints from nearby residents and clean air groups.

Video on the Breathe Project’s Breathe Cam captured video of the emissions, which spewed from one of the plant’s stacks around 6:43 p.m. June 17.

GASP was among those who reported the incident to the Allegheny County Health Department (ACHD) and reached out to U.S. Steel via social media to ask what had happened.

While U.S. Steel has stayed mum on the cause of the emissions, ACHD on Friday morning tweeted:

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