The most common sources of lead emissions are gasoline additives, non-ferrous smelting plants, and battery manufacturing. Historically, lead was added to gasoline as an additive to prevent engine knocking. The lead content of gasoline began to be controlled in the 1970s when legislation was introduced to gradually reduce lead levels. Currently, smelters and battery plants are the major sources of lead nationwide. Human exposure to lead can occur through ingestion or inhalation. The nervous system is most sensitive to the effects of lead and high exposures to lead can result in behavioral and learning disorders. Lead also may be a factor in high blood pressure and heart disease.
Concentrations of lead in the air decreased steadily in the 1980s after the removal of lead from gasoline. On October 15, 2008, EPA revised the national ambient air quality Standards (NAAQS) from 1.5 micorgrams per cubic meter (µg/m3) to 0.15 µg/m3. Michigan has recommended areas for designations (see below) and is currently waiting for more information from EPA.
Lead Infrastructure SIP (04/2012)
May 6, 2013 through June 5, 2013 - Public Comment for Draft Lead Nonattainment SIP for (parital) Ionia County, City of Belding (6/2013)
Information on Lead Monitoring in Belding - View
Recommended EPA Resources: