The Environmental Protection Agency (EPA) in the US has announced it would reconsider its 2008 decision setting national standards for ground-level ozone. The Bush regulation set a maximum airborne concentration for ground-level ozone at 75 parts per billion. EPA's science advisory board had recommended a limit of 60 to 70 parts per billion to adequately protect the elderly, people with respiratory problems and children. "This is one of the most important protection measures we can take to safeguard our health and our environment," said EPA Administrator Lisa Jackson. "Reconsidering these standards and ensuring acceptable levels of ground-level ozone could cut health care costs and make our cities healthier, safer places to live, work and play."