Decree of Government Information Disclosure and Measures on Environmental Information Disclosure （Trial），both of which are related to public rights to know，came into effect on May 1，2008. Institute of Public and Environmental Affairs （IPE） and Natural Resources Defense Council （NRDC） jointly developed Pollution Information Transparency Index （PITI Index），and accordingly conducted a preliminary assessment of the pollution information transparency situations of 113 cities in 2008. According to the researches，the environmental information disclosure is still at the primary stage，and on average the 113 cities barely score 31 out of 100 points.