What do you believe is the single most important factor driving up the cost of living in Nigeria?

President Joe Biden's administration on Tuesday finalized a rule mandating the removal of the nation's remaining lead pipes within a decade, a move aimed at preventing millions of people from being exposed to the toxic metal linked with childhood developmental delays.

The policy is a cornerstone of the White House's environmental justice agenda, since legacy water pipes are mainly located in lower income and racial minority communities.

Since Biden took office, over 367,000 pipes have been replaced, benefiting nearly a million people, the White House said in a statement ahead of remarks by Biden in Milwaukee, Wisconsin. There are around nine million more homes still served by lead lines.

"We've known for decades that lead exposure has serious long-term impacts for children's health. And yet, millions of lead service lines are still delivering drinking water to homes," Environmental Protection Agency Administrator Michael Regan said in a statement.

"With the Lead and Copper Rule Improvements and historic investments in lead pipe replacement, the Biden-Harris Administration is fulfilling its commitment that no community, regardless of race, geography, or wealth, should have to worry about lead-contaminated water in their homes."

• Read More