Jet engine exhaust from airliners endangers human health and adds to climate change, the government found Monday in taking the first step toward regulating those emissions.
Jet engines spew significant amounts of greenhouse gases, including carbon dioxide and methane, into the upper atmosphere, where they trap heat from the sun. But proposed rules such as imposing fuel-efficiency standards have faced stiff opposition from aircraft makers and commercial airlines.
Aircraft emissions were not addressed as part of the landmark global climate agreement agreed to in Paris in December, but the Environmental Protection Agency said it will use its authority under the Clean Air Act to impose limits on aircraft emissions.
“Addressing pollution from aircraft is an important element of U.S. efforts to address climate change,” said Janet McCabe, EPA’s acting assistant administrator for air and radiation.
McCabe said aircraft are the third largest contributor to greenhouse gas emissions in the U.S. transportation sector, and that is expected to increase. Cars and trucks already are regulated.
The EPA finding announced Monday is expected to result in fuel-efficiency standards for domestic carriers, which critics call long overdue. The EPA acted after a coalition of environmental organizations filed notice of their intent to sue the agency over its inaction.
U.S.-owned airliners account for nearly one-third of all aircraft pollution worldwide. While carbon emissions from land-based sources are largely in decline, pollution from airplanes is projected to triple by 2050 without stricter limits.
A spokeswoman for the aviation industry said U.S. air carriers have already been making strides to burn less fuel and generate less harmful exhaust.
“As aviation is a global industry, with airlines operating internationally and aircraft manufacturers selling their aircraft in international markets, it is critical that aircraft emissions standards be set at the international level and not imposed unilaterally by one country or set of countries,” said Jean Medina, of the group Airlines for America.