The Environmental Protection Agency's (EPA) air policy chief is leaving amid ethics concerns.

The agency on Wednesday announced that Bill Wehrum, the head of EPA's Office of Air and Radiation, will leave the agency by the end of June.

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The announcement comes a few months after lawmakers on the House Energy and Commerce Committee launched an investigation into whether Wehrum and his deputy improperly aided former energy industry clients after joining the EPA.

Wehrum, along with the office’s senior counsel, David Harlow, formerly worked at the law firm Hunton Andrews Kurth, where he represented Utility Air Regulatory Group. The umbrella group represents a number of power plant operators that EPA regulates.

The lawmakers wrote an April later to Wehrum’s former employer saying they were “deeply troubled by several reports of unethical behavior by EPA officials, particularly in the Office of Air and Radiation.”

“We are concerned that two former employees of your firm — William Wehrum and David Harlow — may have violated federal ethics rules by helping reverse EPA’s position in ongoing litigation,” Committee Chairman Frank Pallone Jr. Frank Joseph PallonePharma execs say FDA will not lower standards for coronavirus vaccine Dem chairmen urge CMS to prevent nursing homes from seizing stimulus payments Federal watchdog finds cybersecurity vulnerabilities in FCC systems MORE (D-N.J.) wrote in a letter to Hunton that was also signed by Reps. Paul Tonko Paul David TonkoClark rolls out endorsements in assistant Speaker race OVERNIGHT ENERGY: Supreme Court upholds permit for B pipeline under Appalachian Trail | Report finds NOAA 'Sharpiegate' statement 'not based on science' but political influence | EPA faces suit over plan to release genetically engineered mosquito Report finds NOAA 'sharpiegate' statement 'not based on science' but political influence MORE (D-N.Y.) and Diana DeGette Diana Louise DeGette87 lawmakers ask EPA to reverse course after rescinding methane regulations Overnight Health Care: Supreme Court to hear ObamaCare arguments 1 week after election | NYC positive COVID-19 tests hit record low With Biden, advocates sense momentum for lifting abortion funding ban MORE (D-Colo.).

The agency under President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE has rolled back a number of regulations that had long been targets of the coal industry and coal-reliant utilities.

Wehrum specifically was an integral player in relaxing a number of Obama-era pollution rules, including most recently Tuesday’s finalized repeal of the "once in, always in" regulation for sources of air pollution at “major” industrial power plants.

Wehrum has led the EPA’s efforts to repeal and replace the Obama administration’s Clean Power Plan, rolling out a final rule earlier this month to ease restrictions on coal fired power plants, called the American Clean Energy (ACE) rule. That rule is likely to face a court battle.

The head of EPA’s air pollution department has also played a role in shaping the new federal vehicle emissions standards, which critics argue will allow more pollution from tailpipe emissions.

In a statement Wednesday, EPA Administrator Andrew Wheeler Andrew WheelerOVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right EPA threatens to close New York City office after Trump threats to 'anarchist' cities The conservative case for phasing out hydrofluorocarbons MORE suggested that Wehrum had been anticipating leaving the EPA after the finalization of the rules.

“I would like to thank Assistant Administrator Bill Wehrum for his service, his dedication to his job, the leadership he provided to his staff and the agency, and for his friendship," Wheeler wrote. "While I have known of Bill’s desire to leave at the end of this month for quite sometime, the date has still come too soon. I applaud Bill and his team for finalizing the Affordable Clean Energy regulation last week and for the tremendous progress he has made in so many other regulatory initiatives."

Wheeler said Principal Deputy Assistant Administrator Anne Idsal will takeover Wehrum's role.

Environmental groups cheered Wehrum’s departure Wednesday, saying he did more harm than good at the EPA.

“Wehrum did more damage to the Clean Air Act than any other person in the last 40 years,” Brett Hartl, government affairs director at the Center for Biological Diversity, said in a statement. “His legacy will be more premature deaths, more hospital visits and more asthma attacks to our most vulnerable citizens.”

Wehrum is one of a number of EPA employees who have faced criticism over ties to previous clients. Wheeler has also come under fire for appearing to favor regulatory decisions that would benefit his former energy lobbyist clients.

Noah Bookbinder, executive director for watchdog group Citizens for Responsibility and Ethics in Washington, called Wehrum’s departure just the tip of the iceberg for employees who need to leave due to ethical concerns.

“William Wehrum was emblematic of the administration’s struggles to remain ethical," Bookbinder said in a statement. “While it’s a good thing that Wehrum’s potential ethics problems will no longer affect the agency, the tone is set at the top, and if the EPA is to clean up the mess started by Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE, the Trump administration needs to get serious about policing its ethical failures.”

Updated at 11:30 a.m.