The indicator measures to which extent the states provide environmental information in the public domain that include, among other things, information about environmental quality, environmental impacts on health and factors that influence them, in addition to information about legislation and policy, and advice about how to obtain information.

This indicator is an arithmetic average of expert answers to questions on a scale from 0 (worst) to 3 (best): (2.1) To what extent does the law require information on environmental quality to be made proactively available to the public?; (2.2) To what extent does the law require environmental information on environmental factors that influence health be placed in the public domain?; (2.3) To what extent does the law require information on environmental laws and policy be placed in the public domain?; (2.4) To what extent does the law require publicly available information and advice on how to obtain environmental information?; (P2.1) Are real time air quality data for the capital city of your country made available online by the government?; (P2.2) In the last two years, has annual drinking water quality data for water services in your capital city been proactively provided to consumers either by mail (post) or online and do they meet the minimum standards established by the regulatory agency?