Answer: Outlawing asbestos and lead paint.
Step-by-step explanation:
1. On July 12, 1989, EPA issued a final rule banning most asbestos-containing products. (www.epa.gov)
2. Lead-based paints were banned for residential use in 1978. Homes built in the U.S. before 1978 are likely to have some lead-based paint. (www.cdc.gov)