Fig. 4.

Risk profiles for occupational exposure to SARS-CoV-2 via inhalation in the WWTP environment based on the virus concentrations in infected persons' stools (a) when diluted with toilet flush water and (b) when not diluted with toilet flush water during conditions of low, moderate and aggressive outbreak. Depending on the nature of the treatment at the WWTP, the virus concentrations in the raw wastewater are reduced by between 1 and 5 logs. Prominent IIR values (%) are shown on the profiles.