Figure 2
Spline curves showing the non-linear relationship of (A) SO2, (B) CO, (C) O3, and (D) NO2 with systolic blood pressure. The running mean of lag hours 3–5 was used for SO2 and O3, and that of lag hour 2–4 for CO and lag hours 0–2 for NO2.
Figure 2 | Scientific Reports
