Associations of PM2.5, NO2, SO2, and O3 with the log-transformed LDH, total protein, CXCL10, IFN-γ, CD14, and CD62 levels in pleural effusion were determined after adjusting for age, sex, BMI, smoking, and disease category (pneumonia or CHF) (Table 3). Here, CD14 is linked to Pleural effusion.