Lead-based paint exceeding what percent was banned in 1978 for residential housing?

Lead-based paint exceeding what percent was banned in 1978 for residential housing?

• A. 0.06%
• B. 0.01%
• C. 0.6%
• D. 0.006%

Answer: (A)

The threshold being tested is the regulatory limit for lead in residential paint set in 1978. In that year, paint used on residential surfaces was banned if the lead content in the dry film exceeded 0.06% by weight. Put another way, 0.06% by weight equals 600 parts per million, so any paint containing more than 600 ppm lead was prohibited for residential use. This low limit was established to reduce children's exposure to lead from peeling or chipping paint and the dust it creates. The other numbers correspond to different rates (for example, 0.01% is 100 ppm, 0.6% is 6000 ppm, and 0.006% is 60 ppm) and do not reflect the actual regulatory threshold from 1978.

The threshold being tested is the regulatory limit for lead in residential paint set in 1978. In that year, paint used on residential surfaces was banned if the lead content in the dry film exceeded 0.06% by weight. Put another way, 0.06% by weight equals 600 parts per million, so any paint containing more than 600 ppm lead was prohibited for residential use. This low limit was established to reduce children's exposure to lead from peeling or chipping paint and the dust it creates. The other numbers correspond to different rates (for example, 0.01% is 100 ppm, 0.6% is 6000 ppm, and 0.006% is 60 ppm) and do not reflect the actual regulatory threshold from 1978.