Figure 2.

Monthly distribution of personal measurements of ${\mathrm{PM}}_{2.5}$ (left), ${\text{OP}}_{\mathrm{v}}^{\mathrm{DTT}}$ (center), and ${\text{OP}}_{\mathrm{v}}^{\mathrm{AA}}$ (right). See Table S2 for corresponding numeric data. Note: Boxes represent 25th–75th percentiles; the middle horizontal line represents the median; whiskers extend to the most extreme point within 1.5 IQRs of the box and the dots outside boxes indicate outliers. Note: AA, ascorbic acid; DTT, dithiothreitol; IQR, interquartile range; ${\text{OP}}_{\mathrm{v}}^{\mathrm{AA}}$, volume-normalized oxidative potential measured by the AA assay (nmol${/\text{min}/\mathrm{m}}^3$); ${\text{OP}}_{\mathrm{v}}^{\mathrm{DTT}}$, volume-normalized oxidative potential measured by the DTT assay (nmol${/\text{min}/\mathrm{m}}^3$); PM, particulate matter; ${\mathrm{PM}}_{2.5}$, PM with an aerodynamic diameter $<2.5\mathrm{\mu }\mathrm{m}$ ($\mathrm{\mu }\mathrm{g}{/\mathrm{m}}^3$).