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. 2021 Jun 1;790:148190. doi: 10.1016/j.scitotenv.2021.148190

Table 5.

Flows, data sources and reliability estimation for COVID-19 related PPE (masks).

Flows Data source Reliability
Production DTIC, 2020a, DTIC, 2020b High reliability (H). Flow value was based on empirical data and surveys.
Consumption Mass balance Low reliability (L). Flow computed by balancing corresponding inputs and outputs using Sankey diagram software.
Import Van Rensburg (2020) Medium reliability (M). Data reported by different media organisations (GroundUP and News 24) and not scientific, although credible organisations.
Export AmaBhungane (2020) Medium reliability (M). Data reported by a media investigative organisation and not scientific, although a credible organisation.
Waste generated Mass balance Low reliability (L). Flow computed by balancing corresponding inputs and outputs using Sankey diagram software.