The Colorado State University — La Plata County Extension Office will host these radon informational classes in the Pine Room of the La Plata County Fairgrounds, 2500 Main Ave.: Noon to 1:30 p.m. Jan. 7; 6 to 7:30 p.m. Jan. 15; 4 to 5:30 p.m. Jan. 23; noon to 1:30 p.m. Feb. 4; 6 to 7:30 p.m. Feb. 20; and noon to 1:30 p.m. March 3.

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