Reducing emissions of urban air toxics has been a priority for EPA since the passage of the Clean Air Act Amendments in 1990. In the last two decades we've seen significant reductions in urban air toxics as a result of EPA regulations and enforcement actions, as well as the implementation of state and local programs to address emissions from both mobile and stationary sources. Even with this progress, additional work remains to improve our understanding of urban air toxics and to effectively reduce remaining risks, particularly in overburdened communities.