Colorado oil and gas companies used toxic chemicals prohibited under state law in operations near the Rocky Mountains over the last 18 months.
A Capital & Main investigation found that disclosures to the state's fossil fuel regulator showed operators combined banned substances with water, sand, and other chemicals as part of hydraulic fracturing, or "fracking."
can cause cancer, liver toxicity, and adverse effects to nasal tissue
Author's summary: Oil companies used banned toxic chemicals near the Rocky Mountains.