Airborne dioxin levels were comparatively low last year, according to an Environmental Agency survey, but further research is necessary to more accurately determine how the toxin affected air pollution, officials said upon releasing the results Thursday.
The agency conducted the survey in the last summer and winter at 10 places across the country, such as metropolitan areas and residential zones near industrial areas.
The average density of dioxin in each of the 10 areas surveyed fell between 0.095 and 0.32 picograms per cu. meter. All the average figures were below 0.8 picograms, the standard level set under the agency's guidelines established last year, officials said.