In March 2018, the West Virginia Department of Environmental Protection produced a Fact Sheet/Preliminary Findings about the Rockwool site in Jefferson County. The Fact Sheet discloses the presence of six different known or suspected carcinogens in Rockwool's planned air pollution.
These VOCs are also known as Hazardous Air Pollutants (HAPs). Beyond the known cancer-causing chemicals, WVDEP says "All HAPs have other non-carcinogenic chronic and acute effects."
NEW: There's a 7th bonus suspected carcinogen in Rockwool's permit, called Sulfuric Acid Mist (H2SO4). While not in the U.S. toxics database, WVDEP writes that, "The International Agency for Research on Cancer (IARC) has determined that occupational exposure to strong inorganic acid mists containing sulfuric acid is carcinogenic to humans."
Again, we aren't aware that either Rockwool or the WVDEP has publicly modeled the impact of these chemicals on nearby schools.
Here is the listing of HAPs that Rockwool is permitted to emit in "substantive amounts" according to the WVDEP Fact Sheet, pages 40-41: