Car owners and fans of NPR's
Car Talk know that when you get new tires or rotate them, the tires need to be balanced. Often, those tires are balanced with lead weights,
which either disintegrate over time from daily driving, releasing lead
powder into our environment, or are knocked off by curbs and unkempt
roads. Maine, Vermont, and Washington have banned lead weights, and at least California and Iowa are considering similar action. The Environmental Protection Agency
has taken notice, recently signaling that it will work to institute a
nationwide ban of leads weights as Europe has already done.