The Nickel Report

EPA sets and implements primary and secondary National Ambient Air Quality Standards (NAAQS) for six common air pollutants. Primary NAAQS protect the public health, while secondary NAAQS protect the public welfare. Secondary NAAQS have traditionally not been more stringent than primary ones, yet EPA’s staff and science advisors are developing recommendations that EPA promulgate such standards. Any new, more stringent secondary NAAQS would raise significant implementation questions.