A runway closure at Logan International Airport will likely reduce flight traffic above the South End and other southern Boston neighborhoods, temporarily reducing sound and air pollution.

Runway 27 is expected to close sometime over the summer, Jennifer Mehigan of Massachusetts Port Authority media relations department confirmed in an email, to complete an Emergency Materials Arresting System (EMAS) project at the end of the runway.

An EMAS system is intended to stop an aircraft if it is about to go off the runway. Mehigan described it in the email as “sort of like those emergency highway runoff areas for tractor trailers.”

Logan already has EMAS systems at the ends of Runways 33L and 22R, and Massport has recently completed an EMAS project at Worcester Regional Airport.

Mehigan did not have the exact dates of when the project would begin but said that major construction is coordinated with the airlines and operations. She also was not able to say approximately how long the project would take once it begins, only that they would be putting out a press release once they had exact dates.

Aaron Toffler, executive director of the Massport Community Advisory Committee (CAC), said the group heard a presentation on the project during their January general committee meeting.

“I think they’re anticipating two different construction periods. One would start sometime after July first of this year, 2025,” said Toffler. “And then, you know, when they can’t do work anymore because of the weather, they will pause that work, and then they will close the runway again sometime after July first of 2026.”

Steve Fox, chair of the South End Forum and the South End’s representative to the CAC said that because of the way that Runway 27 is situated, with departures coming off the tarmac and flying directly over neighborhoods like South Boston, South End and Roxbury, the closure will mean less noise and air pollution from airplanes in those areas.

It’s not uncommon for neighbors to voice concerns to Fox about noise from planes in the neighborhood, he says, and both noise pollution and air pollution is frequently discussed by the CAC, which have only increased as the airport has grown.

Fox added that about 20 years ago, people in the South End knew that flights would begin to take off from Runway 27 at about 8am, waking up from the overhead rumble.

“Over the past 20 years has shifted from an 8am start to what we’re now seeing as 6am and some even beginning as early at 5:30am,” he said. “So, what we’re seeing is the encroachment of the schedule of flights.”

But it’s tricky for any kind of limits for flight times and runway usage to be put in place, both Fox and Toffler said, as the FAA controls how runways are used.

The closure of Runway 27 will also have impacts on other runways at Logan, Toffler said.

“When one runway goes down, the others will have to take up the slack because there’ll be a similar amount of traffic arriving and departing from the airport,” said Toffler. “Those flights have to go somewhere, and they will likely go to Runway 33.”

Toffler added that during that January presentation, Massport officials indicated that all runways at Logan will probably see some impact from the closure, saying “the sort of intensity of that impact will depend on wind and weather, which is always sort of the deciding, or the determining factor as to which runway gets used.”