Logan International Airport has closed one of its primary runways for maintenance, but residents in the downtown neighborhoodds are yet to report much disruption from the increase in late-night and early morning flights.

Runway 15R-33L was closed on August 15 for maintenance that will take several months to complete.

The closure won’t affect overall flight volume but will reroute many flights over densely populated areas early in the morning and late at night.

15R-33L is often used specifically for noise reduction, putting flights during quiet hours on a northwest/southeast track that routes them over the bay and less populated areas.

The closure will increase air traffic over neighborhoods west of the airport, which are already some of the areas reporting the worst problems with both flight noise and air pollution from low-altitude takeoffs.

“This is the biggest, longest and most often used runway,” said Steve Fox, head of the South End Forum and the neighborhood’s representative on the Massport Community Advisory Committee (CAC) when the closure was announced. “Every other runway is going to get a hell of a lot more traffic, especially departures over South Boston, the South End and even occasionally into the Back Bay.”

While Logan has thought about noise pollution and listed a series of mitigation measures in its press release, they were all focused on reducing noise from the construction itself, which seems unlikely to be louder than the landing airliners that typically use the runway.

There’s also no discussion of air pollution, which is often exacerbated by high-speed takeoffs that don’t gain much altitude before passing over residential areas. The neighborhoods west of Logan already suffer from poor air quality and could be worse in the coming months while construction continues.

Fox does say flight noise is something airport officials take into consideration. It’s been brought up with the CAC before, although residents don’t always agree with the airport’s conclusion.

“We talked about that. We know that Massport is very much aware of it. They predict that there won’t be any significant increase in noise, but to be quite honest those predictions have been a source of widespread disagreement between Massport and communities for as long as I can remember,” he said.

Regardless, it doesn’t seem like the runway closure has had too large of an impact. Fox is yet to hear complaints from residents, though that could change as people return from summer vacations.

“A lot of people are away in August, so it’s probably the worst period to get a sense of what people are experiencing in changes,” he said. “That said, I haven’t heard anything that suggests people are feeling the impact yet.”

The Chinatown Residents Association did respond to a request for comment on whether any members reported an impact from the closure.

The plan to close 15R-33L dates back to late April when the airport’s community advisory committee was informed of the need for repaving. The last time maintenance was done on the runway was in 2012.

In addition to mandatory repaving to keep the surface in good shape, workers plan to use the opportunity to install a range of improvements to the lighting and electrical components of the runway, installing efficient LEDs along its length.

Jennifer Mehigan, Logan’s director of media relations, said it’s too early at this point to predict whether work will be complete on time or take longer than expected.

The planned 100-day schedule would reopen the runway around November 23, right before use of the runway typically picks up again due to winter/spring wind patterns.