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Oklahoma Air Shows First US MCCP Detection, Levels Safe

4/28/2026

Summary

Story summary

Researchers detected medium-chain chlorinated paraffins in Oklahoma air, the first North American observation.
University of Colorado Boulder scientists measured MCCP levels in north-central Oklahoma and found them below health-concern thresholds.
The team suggests that spreading biosolid fertilizer from sewage sludge could release MCCPs into the atmosphere and plans seasonal measurements at locations to track MCCP changes.
Oklahoma lawmakers have banned biosolid fertilizer in certain applications because MCCPs share PFAS-like persistence.

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Story summary

Researchers detected medium-chain chlorinated paraffins in Oklahoma air, the first North American observation.
University of Colorado Boulder scientists measured MCCP levels in north-central Oklahoma and found them below health-concern thresholds.
The team suggests that spreading biosolid fertilizer from sewage sludge could release MCCPs into the atmosphere and plans seasonal measurements at locations to track MCCP changes.
Oklahoma lawmakers have banned biosolid fertilizer in certain applications because MCCPs share PFAS-like persistence.