Did some more digging, and another study [1] on microplastics in shellfish gives this highly informative comparison: """Exposure during meals via dust fallout

Did some more digging, and another study [1] on microplastics in shellfish gives this highly informative comparison: """Exposure during meals via dust fallout in a household is estimated at 13,731–68,415 particles per year""" So to match microplastic intake from dust falling on your food while eating, you'd have to consume at least 10 kg of salt per year in the case where your salt is fairly contaminated and your house is fairly clean (otherwise it would be even higher). FDA says salt intake should be below 1.5 kg (preferrably below 0.8 kg) per year. [1] https://www.sciencedirect.com/science/article/pii/S0269749117344445 https://www.sciencedirect.com/science/article/pii/S026974911...