What could cause toxic gas to shroud the world?
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In my story there has been an event which made the air toxic. Just a few breaths guarantees death.
What event could create such an atmosphere in an unfixable way?
The time is just before WW1. I was thinking some sort of large scale government experiments going wrong, but not sure what.
An idea I had was chlorine gas, but i'm not sure if that would be permanent.
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