On September 30, The Environmental Protection Agency released a second draft of an integrated science assessment, evaluating the available science regarding ozone exposure, and the administration reiterated its commitment to moving forward with its next scheduled five-year review of ozone air quality standards after delaying them in September. EPA must review national ambient air quality standards every five years, by order of the Clean Air Act, and EPA expects a final rule in July 2014. The second draft integrated science assessment, following the first draft released in March, found that research suggested a causal relationship between ozone exposures and death. The rule is open for public comment through November 29.