Carson residents expressed frustration as city officials said the foul odor emanating throughout the city for nearly four weeks may extend to the weekend. Residents began to see a glimmer of hope after LA County Public Works Director (DPW) Mark Pestrella said earlier this week that he expected to see a “significant change in the air quality throughout the week” as the DPW conducted several treatments in the channel. Those hopes were dashed, however, when DPW officials revised the timeline, saying the smell would likely linger into the weekend. Pestrella said previously that the stench was likely caused by a hydrogen sulfide release from decaying vegetation in the Dominguez Channel. Carson Mayor Lula Davis-Holmes said earlier this week that the smell may have been exacerbated by bacteria feeding on decaying pallets and cardboard dumped in the channel after a nearby Prologis warehouse that stored alcohol hand wipes caught fire on …