Since many HN'ers live in the greater Seattle area, it's important to be aware of the Tacoma Smelter Plume: https://ecology.wa.gov/Spills-Cleanup/Contamination

Since many HN'ers live in the greater Seattle area, it's important to be aware of the Tacoma Smelter Plume: https://ecology.wa.gov/Spills-Cleanup/Contamination-cleanup/Cleanup-sites/Tacoma-smelter https://ecology.wa.gov/Spills-Cleanup/Contamination-cleanup/... For almost 100 years, the Asarco Company operated a copper smelter in Tacoma. Air pollution from the smelter settled on the surface soil of more than 1,000 square miles of the Puget Sound basin. Arsenic, lead, and other heavy metals are still in the soil as a result of this pollution.