This Car Tire Chemical Is Polluting The San Francisco Bay: Report
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Last updated: June 9, 2026
A chemical present in car tires, 6PPD-Q, is identified as a significant pollutant in the San Francisco Bay. This chemical is directly linked to the decline and death of salmon species throughout California, particularly impacting endangered Coho Salmon.
- The chemical 6PPD-Q, an "emerging contaminant," is originating from car tires and is contaminating San Francisco Bay watersheds. It was first detected in local streams about six years ago.
- This chemical is highly toxic to certain fish species; even a small amount can be lethal.
- Ezra Miller, Ph.D., a senior scientist at the San Francisco Estuary Institute, stated that 6PPD-Q is a transformation product of an ingredient intentionally added to virtually all tires currently on the market.
- The Coho Salmon, an endangered species, is severely threatened by this pollution.
- Coho Salmon are vital to both stream and ocean ecosystems, aiding in nutrient transport and insect population control.
- Their survival depends on specific habitat needs, including cool, clean streams with unobstructed flow, gravel beds, and ample large debris, making them sensitive indicators of environmental health.
