<p>The blank group has no nutrients. The control groups have no PM<sub>2.5</sub>. A&B, representative IL-6 detection; C&D, TNF-α detection. Significant difference **<i>p</i>< 0.01, *<i>p</i>< 0.05 vs. blank group; <sup>#</sup><i>p</i> < 0.05, <sup>##</sup><i>p</i> < 0.05 vs. previous group in the bar graph.</p