Study on the Mechanism of Curcumin Regulating Lung Injury Induced by Outdoor Fine Particulate Matter (PM2.5)

Table 1

Pathology classification standard of lung injury.

Grading	Basis
0	Alveolar wall intact without thickening, no inflammatory infiltration, no congestion
1	Slight diffuse inflammatory cell infiltration (neutrophils) in the alveolar wall, no thickening of the alveolar wall
2	Obvious and extensive inflammatory cells (neutrophils and monocytes) infiltrated, slightly thickened alveolar walls (1-2 times)
3	Severe inflammatory cell infiltration, basal thickening of alveolar wall in individual areas (2-3 times)
4	Severe inflammatory cell infiltration, thickened alveolar wall, 25-50% pulmonary consolidation
5	Severe inflammatory cell infiltration, thickened alveolar wall, >50% pulmonary consolidation