Environmental conditions play a very important role in hu-man life.Nowadays, environmental data and measurements are freely made available through dedicated web sites, ser-vices and portals. This work deals with the problem of discovering such web resources by proposing an interactive domain-specific search engine, which is built on top of a general purpose search engine, employing supervised ma-chine learning and advanced interactive visualization tech-niques. Our experiments and the evaluation show that in-teractive classification based on visualization improves the performance of the system.