Fig. 1.
Prevalence of infection estimates and WW measured concentrations for SARS-CoV-2 (N1 assay) (a) WWTP-J in Barcelona, (b) WWTP-H and (c) WWTP-G. Values below LOQ are marked with an inverted triangle on the x-axis. WW values are expressed as daily loads. The sum of cases shows in shades of red were calculated using Eq. (2) (bright red), Eq. (3) (crimson-red), Eq. (4) (pastel red). Both y-axis are in log10 scale. The shading represents the enforced measures at the time: SL = strict lockdown; RM = reduce mobility.