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(a) Geometric mean PGEs (≤g/m3) associated with water-based cleaning frequency, according to excess indoor humidity (g/m3). (b) Geometric mean PGEs (≤g/m3) associated with repainting history, according to excess indoor humidity (g/m3). (c) Geometric mean PGEs (≤g/m3) associated with age of the surface material, according to excess indoor humidity (g/m3).
