Fig. 2From: Characterization of residential household dust from Shanghai by particle size and analysis of organophosphorus flame retardants and metalsSEM images of Shanghai household dust fractions: A F1, 190–390 µm; B F2, 75–190 µm; C F3, 25–75 µm; D F4, cyclone, 4–25 µm; and E F5e, 2.22 ± 2.04 µmBack to article page