An odor advisory was issued Sunday for the Coachella Valley, warning of a continuing trend of hydrogen sulfide gas emissions in the area. Southwestern winds could carry the odors to other areas of the Valley, according to the AQMD.

Hourly average concentrations of hydrogen sulfide reached a peak of 81 parts per billion near midnight Saturday, the AQMD reported. However, the gas is not expected to remain above the state standard for long Sunday. The state standard for outdoor levels of hydrogen sulfide is 30 parts per billion, at which level headaches and nausea are common. The advisory is in effect until midnight on Monday.