EAST COBB — People in parts of east Cobb may smell natural gas today, but it will likely be due to Atlanta Gas Light’s purging of its Johnson Header Pipeline, and the company says there is no danger to residents.

The natural-gas release is to begin early today at Powers Ferry Road near Interstate 285 and is expected to last a few hours, said Matthew Freeman, an AGL spokesman. The purge will continue to the Willeo Road regulator station near the Chattahoochee River.

“There is potential for noise and odor at those end points, as well as at the valve sites at Johnson Ferry Road near the Chattahoochee River and around the intersection of Johnson Ferry Road and Lower Roswell Road,” he said.

There is no danger to residents during such a release, Freeman said.

Purging a line may create a loud noise, similar to a jet flying overhead, that may last up to an hour, according to the company.

After the line is purged, it will be cleaned and dried using air compressors, which may also be noisy. The drying could take up to two days, according to the company.

The work near the Johnson Ferry-Lower Roswell intersection will force traffic restrictions from 9 a.m. to 4 p.m. for up to 10 days.

Beginning April 16, AGL crews will be installing a regulator station adjacent to Mount Bethel Park, in the same area, which will again force some lane closures. The installation work is expected to last through June, the company said.

In a separate project, AGL crews are working along Cobb Parkway between South Marietta Parkway and Windy Ridge Parkway to replace underground pipelines. The work is expected to continue until November, though crews will not be working during peak travel times, according to the company.