These are just some of the effects of President Trump’s large-scale rollback of environmental regulations over two years, which have been promoted as creating jobs, liberating businesses and helping the economy grow.

But as our reporters discovered, the policy changes are affecting the health and safety of people across the United States.

Go deeper: Mr. Trump has been working to undermine the environmental legacy of President Barack Obama. Nearly 80 Obama-era regulations have been blocked, delayed or targeted for repeal, according to our analysis. Here are some other takeaways from our investigation.