EPA has expanded its Trump-era emergency approval for an airborne antimicrobial treatment designed to kill the coronavirus that causes COVID-19 in indoor air, allowing industry to use the product “Grignard Pure” in four additional states -- up from the two the agency certified in January. The agency quietly updated its Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) exemption for the product on July 1, allowing its use in Maryland, Nevada, Pennsylvania and Texas. The original approval, issued on Jan. 14,...