Under the Act of 13 June 2008 to ratify the Stockholm Convention on Persistent Organic Pollutants, hereinafter "the Act on ratification of the Stockholm Convention", the Convention was ratified by the Polish President on 30 September 2008 . The Convention entered into force in the Republic of Poland on 21 January 2009 under the government's statement of 2 December 2008 on the binding force of the Stockholm Convention on Persistent Organic Pollutants, signed in Stockholm on 22 May 2001 (Journal of Laws of 2009, No. 14, item 77).