Corporate environmental information disclosures (EIDs) are important policy tools for environmental protection. This paper assesses and longitudinally examines EID changes in Chinese listed nonferrous metal companies from 2008 to 2012 through their annual, social responsibility, environmental, and sustainability reports. Using content analysis and multivariate regression methods, we fi nd a signifi cant increase in the quantity and quality of corporate EIDs post-2010, though the overall level is still not high. Company size, profi tability, and government regulation signifi cantly and positively affect EID. In addition, we fi nd that state-owned enterprises are more likely to disclose environmental information than private ones.