CARSON, Calif.—Air monitoring has revealed “very low levels of hydrogen sulfide” from a foul odor that has been reported for days near the Dominguez Channel in the Carson area, Los Angeles County health officials announced. A statement issued Saturday reads in part: “Los Angeles County Public Works and Public Health teams have preliminary findings that indicate the origin for the odor is from an organic material drying out after being left on the channel banks during low tide.” It also said, “Public Health conducted air monitoring over the last two days and found very low levels of hydrogen sulfide in the air (.4-.9 ppm) east of the Dominguez Channel. At these low levels, hydrogen sulfide does not have long-term health effects, but does cause nuisance odors that may cause short-term symptoms and impact quality of life.” Nevertheless, the statement noted that some residents may experience temporary symptoms such as headaches, …