Oceans are global. There are no borders when it comes to pollutants. It takes eight days for contaminants carried by clouds to travel from Asia to our coastal waters in Vancouver. It takes eight days when they're transported by air. That likely includes plastic fibres.
When pollutants from Asia are carried by ocean currents, it takes a year for them to reach our coastal waters in Vancouver. Therefore, if we export problems, eventually they'll end up in our coastal waters.
It has been estimated that most of the polyester microfibres found in the Arctic originated in the North Atlantic, Europe, North America and so on. They are contaminating our waters in the Arctic.