Historical clue formulations

• Discharge, as of gas — 2021-07-06
• Substance discharged — 2020-03-29
• E.P.A. concern — 2016-09-29
• E.P.A. measurement — 2010-12-25
• Release — 2006-07-15
• Discharge into the air — 2006-02-05
• Discharge — 1999-10-26