The U.S. Environmental Protection Agency announced on Nov. 13 plans to place more stringent restrictions on pollution from heavy-duty trucks, according to an article on The Washington Post website.

The agency did not issue a specific proposal, which is unlikely to come until 2020, but officials said they plan to start the formal rulemaking process for what they are calling the Cleaner Trucks Initiative.

The effort will target reductions of nitrogen oxide, or NOx, which has not been updated in the last two decades. EPA Acting Administrator Andrew Wheeler says, “This initiative will help modernize heavy-duty truck engines, improving their efficiency and providing cleaner air for all Americans.”

The announcement came as a surprise to many as it’s one of the few actions the EPA had taken to combat air pollution during the Trump administration.

Some industry groups welcomed the announcement, as Allen Schaeffer, executive director of the Diesel Technology Forum, says, “This new initiative sets the next chapter for diesel technology.” He says that the effort will probably result in cleaner engines that perform better, last longer and improve air quality.