An odor advisory issued last week for the Coachella Valley to elevated levels of hydrogen sulfide that smell like rotten eggs was extended again on Monday, this time for another two days.

It is now set to expire Wednesday afternoon.

The advisory had already been extended three times since Aug. 18 due to the stench emanating from a sparsely populated area immediately downwind from the Salton Sea.

The South Coast Air Quality Management District issued the advisory after detecting hydrogen sulfide concentrations at 239 parts per billion, exceeding the state standard of 30 parts per billion.