NAPA COUNTY (CBS SF) — Four vineyard workers were treated for respiratory problems Tuesday after being exposed to pesticides sprayed on Monday night, according to the Napa County Sheriff’s Office.

The workers experienced breathing problems around 8:30 a.m. after arriving for work, Napa sheriff’s Capt. Tracey Stuart said.

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The vineyard had sprayed 21 acres with chemical products including Sylgard, Flint and Altacor, Stuart said.

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The vineyard covers 80 acres in the 4000 block of Big Ranch Road near Oak Knoll Avenue, north of Napa, Stuart said.

The workers were taken to Queen of the Valley Medical Center in Napa.

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