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.
Located in the south-central United States, the Ozarks are a heavily forested group of highlands. They extend southwestward from St. Louis, Missouri, to the Arkansas River. Along with the adjacent Ouachita Mountains, they represent the largest area of rugged topography between the Appalachians and the Rockies.