Minnesota air pollution regulators are appealing a court decision that relaxed airborne asbestos testing requirements along the North Shore around the town of Silver Bay.
The Minnesota Pollution Control Agency contends that relaxing the air quality standards and testing requirements would be harmful to the health of residents of Minnesota.
From 1975 to 2007, Northshore Mining Company monitored asbestos particles in air emissions in the vicinity of its plant, comparing the numbers to asbsestos fiber counts in the vicinity of St. Paul, under federal court order.
Northshore Mining officials argued the testing requirement was outdated and unnecessary and tried for years to get the requirement lifted. Pollution control officials said the mining company should do an environmental study before dropping the air testing—a proposal the company disputed.
In 2007, State District Judge Kenneth Sandvik agreed with Northside that the air pollution agency had more than 30 years to justify the testing and the harm caused by the fibers.
In appealing the district court decision to the Minnesota Court of Appeals this month, air pollution control officials contend the air monitoring will help predict how many residents will succumb to asbestos-related diseases including lung cancer, mesothelioma, a cancer of the lining of the lung, and asbestosis, a chronic scarring.
State investigators are not sure whether asbestos fibers detected in hundreds of tests are released from taconite mining near Babbit, or processing at the plant in Silver Bay.
Still, University of Minnesota health investigators have detected an unusually high incidence of respiratory disease in the northern tier of Minnesota counties. The University of Minnesota now has underway a comprehensive three- to five-year, $4.8 million study of the respiratory health of taconite workers in northern Minnesota. An earlier study linked taconite miners who had developed mesothelioma to commercial asbestos exposure in the mines.
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