The criterion level, often abbreviated as Lc, is the steady noise level permitted for a full eight-hour work shift. This is 85 dB(A) in most jurisdictions, but it is 90 dB(A) in Quebec and 87 dB(A) for organizations that follow the Canadian federal noise regulations.
Royal Catchfly (Silene regia) This striking plant may grow as high as five feet, with bright red flowers. It flowers from May through September, and can be seen in remnant prairies and open woods. In Missouri, it is known only in the Ozarks.
Print and broadcast media have explored Ozark culture broadly. Books set in the Ozarks include Where the Red Fern Grows, The Shepherd of the Hills and As a Friend. The 1999 film Ride with the Devil, based on the book Woe to Live On, depicts warfare in Southwest Missouri during the Civil War.