Under the Clean Air Act, EPA sets and reviews national air quality standards for lead. Air quality monitors measure concentrations of lead throughout the country. EPA, state, tribal and local agencies use those data to ensure that lead is at levels that protect public health and the environment. EPA has tracked air quality trends for lead using data from this network of monitors. Nationally, average lead concentrations decreased dramatically after EPA's regulations reduced the lead content in on-road motor vehicle gasoline. For information on lead standards, sources, health effects, and programs to reduce lead, please see www.epa.gov/airquality/lead and www.epa.gov/otaq/aviation.htm.
Air quality trends can vary from one area to another. Local trends can be viewed at individual monitoring locations in the map below or in this KML file (KML, 573 KB) using Google Earth or another KML browser.Lead monitors that meet mimimum trends completeness criteria
Lead monitors that have some data during the trend period but do not meet the mimimum trends completeness criteria