It's one of those "is the air quality alert because of the refinery fuckup or the wildfires?" kinds of days (I think it's both?)
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Details about the refinery:
https://abc7chicago.com/sulfur-smell-in ... /13428050/
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But what it boils down to* is "our facilities are so poorly maintained they literally can't hold up against a stiff breeze, and we released so much unnamed mystery gas(es) that people are fleeing the smell a state away." (the article only mentions Indiana, but the smell made it to Michigan too)
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*"unplanned flaring of gases" sounds like it's trying pretty hard to be Soviet, but missed the memo about never admitting under any circumstances that something isn't according to plan