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Piles of coal sit in front of Pacificorp's 1440 megawatt coal fired power plant. Photo: George Frey/Getty Images

The Environmental Protection Agency is about to set in motion a review of one of the most significant — and expensive — air-pollution regulations the agency has ever issued.

The big picture: The rule, which sets first-ever federal limits on mercury and other toxic air pollution from coal-fired power plants, was issued in 2012 and virtually all operating coal plants are complying with it now.

The bottom line: Given that compliance, whatever EPA does probably won’t make a difference in President Trump’s goal to revive coal. But the agency's move could make it easier for currently-operating coal plants to comply with it and also the way future regulations are written.

Driving the news: The agency is going to soon send for review a draft proposal to the White House questioning the finding that the EPA needed to set the standards at all, according to Bloomberg Environment, which first reported the news Wednesday. An EPA spokeswoman also told Axios the agency plans to address questions raised by a Supreme Court ruling in 2015 finding that Obama’s EPA didn’t consider costs appropriately when writing the rule.

Flashback: This rule has a long and litigious history going back decades, but let’s focus on just what occurred under President Obama.

  • When Obama’s EPA issued the rule, it found it would cost power companies an annual $9.6 billion, making it one of the EPA’s most expensive regulations ever.
  • The agency said the public-health benefits of between $37 billion and $90 billion per year outweighed those costs.
  • The EPA arrived at those large benefit numbers by including indirect pollution co-benefits other than direct reduction in mercury pollution, a move Trump’s EPA is likely to review.

What’s next: The EPA will issue a draft proposal within the next few months, which will go through a public comment period before it becomes final after that.

Go deeper

Updated 3 hours ago - World

Islamic State claims responsibility for deadly bombing in southern Afghanistan

The mosque after the explosion in southern Kandahar province on Oct. 15. Photo: Murteza Khaliqi/Anadolu Agency via Getty Images

The Islamic State group claimed responsibility for a massive blast that tore through a crowded Shiite mosque in the southern Afghan city of Kandahar on Friday, killing at least 47 people and injuring dozens more, AP reports.

Why it matters: Friday's attack was the deadliest to strike Afghanistan since the U.S. withdrew its troops from the region and is the second major attack on a Shiite mosque in a week, underscoring the Taliban's growing security threat from other militant groups.

New wave of strikes will test worker power

Illustration: Sarah Grillo/Axios

Thousands of John Deere workers hit the picket line this week after the union smacked down a new worker contract from the farm and equipment maker.

Why it matters: There’s a wave of worker angst spreading across the country. They wield new power that’s come with a historic worker shortage.

Bryan Walsh, author of Future
5 hours ago - Technology

The smart city comes of age

Illustration: Aïda Amer/Axios

Better sensors, more intelligent AI, and the coming wave of 5G wireless could finally fulfill the promise of the smart city.

Why it matters: How we organize, run and power our cities will be increasingly important in the years ahead, as urbanization expands and the damaging effects of climate change compound.