The Oregon Health Authority says an increase in selenium concentrations near Bullseye Glass Company has prompted an inspection.
Data from a device near the Children’s Creative Learning Center in Southeast Portland showed slightly elevated concentrations of selenium on September 6.
Selenium is an essential nutrient needed in the human body, but it can be hazardous at high levels.
Bullseye has been in trouble with the state several times this year for similar emissions problems.
The glass factory installed a new filtration baghouse to help reduce emissions from 11 or more furnaces, but the OHA says it was not effective in reducing the selenium spike.