ABSTRACT
Over the past three decades, the U.S. has invested hundreds of billions of dollars to enhance and protect air quality in our cities, metropolitan areas, and countrysides. Most pollution control efforts have focused on protecting public health. These efforts to protect human health from ambient pollutant exposures have for the most part failed to consider other airborne exposures to toxic pollutants: most notable are exposures occurring indoors, in our homes, and in our nonindustrial work environments.
