The United States Department of State (DoS) oversees the diplomatic missions of the U.S. at more than 270 locations abroad. Thousands of government employees and their families live in overseas locations and more than half of DoS posts are in cities where air pollution is significantly worse than the worst areas of the United States. The committee meets three times per year to discuss issues related to extreme air pollution and health, best practices for health monitoring, medical intervention, risk assessment and exposure mitigation, as well as the communication of risks and protective measures.