2018/10/17: New research shows microplastics in 90 percent of the table salt brands sampled worldwide. Of 39 salt brands tested, 36 had microplastics in them, according to a new analysis by researchers in South Korea and Greenpeace East Asia. Salt samples from 21 countries in Europe, North and South America, Africa, and Asia were analyzed. The three brands that did not contain microplastics are from Taiwan (refined sea salt), China (refined rock salt), and France (unrefined sea salt produced by solar evaporation). The study was published this month in the journal Environmental Science & Technology.
The density of microplastics found in salt varied dramatically among different brands, but those from Asian brands were especially high, the study found. The highest quantities of microplastics were found in salt sold in Indonesia. Asia is a hot spot for plastic pollution, and Indonesia -- with 34,000 miles (54,720 km) of coastline -- ranked in an unrelated 2015 study as suffering the second-worst level of plastic pollution in the world. In another indicator of the geographic density of plastic pollution, microplastics levels were highest in sea salt, followed by lake salt and then rock salt.
Even though the study found that the average adult consumes approximately 2,000 microplastics per year through salt, it's not clear what the health consequences are.
the focus on microplastics may divert attention from worse environmental (and more easily identifiable) pollution problems, such as small particles released from car tires.