The health warning Robyn Parker sat on for 24 hours

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The NSW Opposition has released the alert sent from the Office of Environment and Heritage to the Minister for Environment, Robyn Parker at 4.30pm on Wednesday, 10 August.

Despite knowing the airborne Orica hexavalent chromium leak was dangerous if inhaled, the Minister took no steps to inform the public until 3.27pm on Thursday, 11 August.

"Departmental emails prove the Environment Minister knew of the safety threat to Stockton residents and chose not to act for at least 24 hours,” Opposition Leader, John Robertson said.

“The Premier must stand Robyn Parker down pending the outcome of the independent inquiry into this incident.”

“The Minister has put politics above public safety and must be stood down,” Shadow Environment Minister, Luke Foley said.