'Everywhere we looked': trillions of microplastics found in San Francisco bay

Most comprehensive study to date finds plastic in sediment collected from bay and tributaries and digestive tracts of fish

The most comprehensive study to date of microplastics in California has turned up a mind-boggling amount of plastic particles in the San Francisco bay.

An estimated 7tn pieces of microplastics flow into the San Francisco bay via stormwater drains alone, researchers discovered. Nearly half of the microscopic particles found in stormwater looked suspiciously like tiny fragments of car tires, which rainfall washes off the streets and into the ocean.