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Table 2 San Francisco Bay case study summary. The sample hazard is based on the type and number of particles. The risk also incorporates the volume concentration in the sample

From: Microplastics: a multidimensional contaminant requires a multidimensional framework for assessing risk

Sample number Sample type Total number of MPs Sample volume (L) Concentration (# MP/ L) Sample hazard Sample risk
1 Stormwater 1202 197 6.10 2908.6 14.76
2 Manta trawl 173 176,000 0.00098 406.1 0.0023
3 Wastewater 77 916 0.084 170.6 0.19