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Aarhus Convention: http://www.unece.org/environmental-policy/treaties/public-participation/aarhus-convention.html
The full history and text of the Aarhus convention can be found here with details of ratification and other news on the development of the provisions. The EU position along with access to the various directives which implement the requirements of the convention can be found at http://ec.europa.eu/environment/aarhus/
What’s in Your Backyard?: www.environment-agency.gov.uk/maps/
European Pollutant Emission Register: http://www.eea.europa.eu/data-and-maps/data/eper-the-european-pollutant-emission-register-4
This implements the UNECE PRTR Protocol (http://www.unece.org/env/pp/prtr.htm), signed in May 2003 in Kiev.
Of course, for most people with a specific interest, the information they need is not generally available over the Internet - hence the need to have a system based around requests to regulatory bodies.
Right to Know Guide: http://community.foe.co.uk/tools/right_to_know/
A practical hands-on guide to freedom of environmental information.
Information Commissioner: https://ico.org.uk/
Practical information on appeals etc. can be found on the Information Commissioner's website.