Table 3.

Cross-sectional studies about workplace measurements of formaldehyde in Korea

Authors (Years)	Subjects and measurements	Formaldehyde concentration, ppm Geometric mean (range)
Park et al., (1998) [13]	19 workers in 9 histological laboratories in each hospitals. Personal and area sampling to assess TWA and STEL	TWA (8 h) Personal 0.31 (0.02–3.86) Area 0.61 (0.08–1.49). STEL (15 min) Personal 1.88 (0.59–5.01) Area 1.42 (0.31–4.24)
Park et al.,(2006) [14]	80 students in a gross anatomy laboratory in a college of medicine. Area sampling at 4 spots 5 times each	TWA (8 h) Area 1.51 (0.26–3.91)
Kim et al. (2009) [15]	48 workers in endoscopy units in 4 hospitals. Personal samplings to assess TWA and STEL.	TWA (8 h) Personal 0.056 (0.003–0.923) STEL (15 min) Personal 1.428 (0.103–14.773)
Lee et al., (2012) [16]	In curling and compounding process of two tire plants, 12 personal sampling to assess TWA.	TWA (8 h) Personal 0.029 (0.027–0.029) (highest within 4 spots)
Yoo et al.,(2014) [17]	Workers handle medium density fiberboard and veneer in a furniture manufacturing factory. Air concentration of formaldehyde handling wood glue and wet veneer at room temperature, 100 °C and 150 °C	(Handling wet veneer at 150 °C, 2.70 ppm)
Gu et al., (2014) [18]	62 nurses in 8 ambulatory care units in 2 hospitals. Personal samplings to assess TWA.	TWA (8 h) Personal 0.023 (0.001–0.258)

TWA, Time weighted average; STEL, Short-term exposure limit