According to the picture ( @ https://qzprod.files.wordpress... ) even salt mined from rock mines were found to be contaminated with traceable amount of plastics
As TFA puts it —
" Although the oceans close to China appear to be a “hotspot” for microplastic pollutants, it is unlikely Chinese table salt is the only salt that is contaminated with plastics "
An American researcher also chimed in —
" Plastics have become such a ubiquitous contaminant, I doubt it matters whether you look for plastic in sea salt on Chinese or American supermarket shelves," Sherri Mason, an environmental science researcher at the State University of New York Fredonia told Scientific American. "I'd like to see some 'me-too' studies,” she added "