The present study evaluated residential exposure to atmospheric formaldehyde and acetaldehyde according to distance from the a dyeing industry complex (DIC). This purpose was achieved by measuring concurrently the outdoor air concentrations in residences near the DIC and a certain distance away, plus the outdoor air concentrations at two industrial areas within the DIC boundary. Formaldehyde concentrations (median values of 24.3 and 22.5 μg/㎥ in IS1 and IS2, respectively) were higher than acetaldehyde concentrations (median values of 7.4 and 7.3 μg/㎥ in IS1 and IS2, respectively) at both sites. However, there was no significant difference in the industrial outdoor air concentrations of both formaldehyde and acetaldehyde between the two sites. In addition, the median formaldehyde concentration from the residential site near the DIC (RS1) was about 1.5 times higher than that from the residential site far away from the DIC(RS2), and the median acetaldehyde concentration from RS1 was about 1.3 times higher than that from RS2. It is noteworthy that the mean or median risk as well as these maximum risks are well above the USEPA's permissible risk level of 10 -6 from environmental exposure. This suggests that appropriate management for formaldehyde and acetaldehyde is necessary in order to decrease risk of the residents of study areas, regardless of the distance from the DIC.

Abstract
 1. Introduction
 2. Methods
  2.1. Study design
  2.2. Sampling and analysis
 3. Results
  3.1. QA results
  3.2. Comparison of Two Industrial Sites for AmbientAldehyde Levels
  3.3. Comparison of Residential and Industrial Sitesfor Ambient Aldehyde Levels
  3.4. Correlation between residential and industrialsites
  3.5. Residents' interview
 4. Discussion
 5. Conclusions
 References

• Wan-Kuen Jo(Department of Environmental Engineering, Kyungpook National University) Corresponding Author
• Jin-Woo Lee(Department of Environmental Engineering, Kyungpook National University)