Fig. 4
From: The effect of ambient PM2.5 exposure on survival of lung cancer patients after lobectomy
Survival after lung cancer surgery in patients with exposure to different PM2.5 concentrations. The high-exposure group was defined as those exposed to a PM2.5 concentration above the median, and the low-exposure group was defined as those exposed to a PM2.5 concentration below the median. PM2.5: fine particulate matter