The United Nations Economic Commission for Europe Convention on Access to Information, Public Participation in Decision-Making and Access to Justice in Environmental Matters was adopted on 25 June 1998 in the Danish city of Aarhus. According to its provisions each state Part shall, within the framework of the national legal order, ensure that members of the public concerned have access to a review procedure before a court of law or another independent and impartial body established by law. At the same time, it contains regulations specifying the criteria that constitute the basis for determining persons enjoying rights to access justice with respect to national legal orders. Poland, being one of the state Parties, introduced into national legal order special provisions enabling implementation of the Aarhus Convention, including regulations concerning parties to proceedings in environmental matters. The aim of the study is to analyse and assess these regulations in the light of the requirements adopted in the Aarhus Convention and to formulate general conclusions in the field of key issues of the international and European environmental law and policy.