Question

Decades ago, most of the paint used in the US was lead-based because it was cheap, long lasting, and widely available. When scientists recognized that this was polluting the air with toxic lead, laws banned lead-based paint, and the paint industry developed more cost-effective paints that do not contain lead.

What was most likely the type of problem lead-based paint had that was solved by using paints without lead?

limited availability
ineffective for most uses
lack of durability
health risk to users

Answer 1

health risk to users

Scientists found lead paint polluted the air with toxic lead, so replacing it removed that health hazard.