What are the federal air quality standards for sulfur oxides in parts per million?

The federal air quality standards for sulfur oxides, which include sulfur dioxide (SO2), are established to protect public health and the environment. The standard for sulfur oxides is set at 0.03 parts per million (ppm) for the one-hour average, along with a secondary standard designed to protect ecosystem health. This level is based on extensive scientific research indicating that concentrations above this threshold can pose adverse health risks, particularly for vulnerable populations such as individuals with respiratory ailments, children, and the elderly.

By maintaining the standard at 0.03 ppm, regulatory agencies aim to minimize the risk of respiratory problems, as well as environmental damage including acid rain and harm to wildlife. This standard is a critical component of the Air Quality Standards established by the Environmental Protection Agency (EPA) under the Clean Air Act. Understanding this standard is crucial for professionals in environmental health as it informs policy, regulation, and health protection efforts.