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Figure 3. LDL-C Levels and Prevalence of Abnormal LDL-C among Participants Exposed to Different Combinations of PM_2.5 and O₃. (A) The vertical axis represents the LDL-C level, and the error bars represent the SE; SE = SD/$$ \sqrt{n} \\ $$; (B) The vertical axis represents the proportion of the population with abnormal LDL-C; According to the “Chinese Guidelines for the Management of Blood Lipid Disorders (2023)”, participants with LDL-C ≥ 4.1 mmol/L are considered to have abnormal LDL-C; * P < 0.05, ** P < 0.01, *** P < 0.001. LDL-C: Low-density lipoprotein cholesterol; PM: particulate matter; O₃: ozone; SE: standard error; SD: standard deviation.