The National Weather Service in Guam says residents should continue to monitor information from their service as well as the local emergency management offices.
It says people with respiratory health problems should minimise time outdoors when the haze is evident.
Mariners and pilots have also been warned to be aware of the slightly lower visibility.
Satellite imagery shows a dense plume of haze spanning the central Pacific that becomes more diffused closer to the Marianas.
The haze is being carried along by the east-northeast trade winds.