The Obama administration on Wednesday proposed stricter curbs on ground-level ozone, a pollutant linked to several serious health conditions. Industry groups said the move would place a heavy burden on the U.S. economy.

The Environmental Protection Agency said it would set the National Ambient Air Quality Standard for ozone at 65 to 70 parts per billion and would consider public comments on standards within a range of 60 to 75 ppb.

The EPA must finalize the rule by October. It will replace the current standard of 75 ppb set in 2008.