Fig. 2: Updated inventory of US wastewater emissions.

a–c, Probability density functions (PDFs) of US sector-wide domestic wastewater treatment emissions of CH4 (a), N2O (b) and NH3 (c). d, PDF of combined direct GHG emissions of CH4 and N2O. The dashed black lines and grey shaded regions in a, b and d depict the means and 95% CIs from the US EPA inventory for 202210, respectively, and the orange lines and shaded regions depict the means of the updated, measurement-informed inventory and associated 95% CIs, respectively.