Fig. 1: Comparison of organic product usage, EFs and PM2.5 yields across different methodologies.
From: Criteria pollutant impacts of volatile chemical products informed by near-field modelling
a, Organic product usage per person \(\overline {S_i}\) (total height of the bars including unfilled portion) and \(\overline {{\mathrm{EF}}_i}\) values attenuated by washing down the drain (filled portion of the bars). The \(\overline {S_i}\) and \(\overline {{\mathrm{EF}}_i}\) values labelled ‘CA’ are California-specific; the other values are nationwide estimates. \(\overline {S_i}\) for household products in SHEDS (one unfilled bar) and the total \(\overline {S_i}\) and \(\overline {{\mathrm{EF}}_i}\) (the rightmost bar cluster) values are ×5 higher than the y axis as indicated by the ×5 label; the asterisks indicate that data are not available. Also note that \(\overline {S_i}\) estimates are not shown for the California component of the 2011 NEI (only \(\overline {{\mathrm{EF}}_i}\) values are available for the California component). b, PM2.5 yields by mass organic gases reacted estimated by McDonald et al.1 and upper bound estimates for prompt formation in the CMAQ modelling system. The PM2.5 yield of 5% by mass of organic gases was adopted in the CMAQ feasible solution; however, a PM2.5 yield of 10% (represented by the star on the far right) also resulted in PM2.5 SOA concentrations consistent with measurements
