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I researched the final level of the Blight Lab, but there is no way to upgrade my Extermination Stations to Hazmat Stations. Is there something I am missing? The upgrade symbol does not appear in the Extermination Station's menu.
It's actually an upgrade to the Environmental Station (the building you used to use to clean pollution dumps). The Extermination Stations only clear out warrens and lairs, not cores.