Janesville27.5°

Rock County meets ozone standards

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Gazette Staff
October 26, 2007
— For the summer of 2007, Rock County continued to meet the federal ozone standard of 85 parts per billion. Averaging ozone levels from 2007 with levels in 2005 and 2006, Rock County had a three-year average ozone level of 74 parts per billion. In 2007, the worst 8-hour ozone reading in Rock County was on June 11, when the level reached 82 parts per billion.

Rock County’s three-year average level in 1999 was 87 parts per billion. In 2002, changes to the Clean Air Act made 85 parts per billion the effective standard.


Achieving the eight-hour ozone standards means Rock County residents breathe cleaner air than those in larger metropolitan areas such as Chicago. The cleaner air also allows Rock County businesses to avoid more costly air pollution controls that are needed to bring “non-attainment” areas into compliance.


For more information, call (608) 755-3181.



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