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. 2021 Apr 21;21(6):662. doi: 10.3892/etm.2021.10094

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Copyright: © Jiao et al.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Stained sections of lung tissues following exposure to OPP^2.5 particles (80 µg), PPP^2.5 particles (80 µg) or vehicle (50 µl sterile saline). Widening alveolar septa (black arrows) and notable inflammatory cell infiltration were induced by OPP^2.5 and PPP^2.5. Magnification, x40 (n=3/group). OPP^2.5, original atmospheric particulate matter with a diameter ≤2.5 µm; PPP^2.5, pure atmospheric particulate matter with a diameter ≤2.5 µm.