Julann Spromberg, a research toxicologist with Ocean Associates Inc., working under contract with NOAA Fisheries, observes a salmon placed in a tank of clear water after it died from four hours of exposure to unfiltered highway runoff water on Oct. 20, 2014. The Environmental Protection Agency on Nov. 2, 2023, granted a petition submitted by Native American tribes in California and Washington state asking federal regulators to prohibit the use of the chemical 6PPD in tires due to its lethal effect on salmon, steelhead trout, and other wildlife. (AP Photo/Ted S. Warren, File)
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